Office 2024 Pro Plus, Win 11, Using Outlook Classic installed by MS Support team. Authentication Problems

Question

Office 2024 Pro Plus, Win 11, Using Outlook Classic installed by MS Support team. Authentication Problems

Sivea Key 0

I have MS Office 2024 Professional Plus for Windows Lifetime license. I do not have Office (new) in Installed Apps on Windows 11. I have Outlook v 1.2026.902.100 installed in Apps. In fact, I have no idea whether that is Classic Outlook. I did not do the work. the MS Tech Supp agent did. And it worked for a while. The version of Outlook that Office 2024 came with would not add some of my email addresses so the MS support person logged on and said he installed Outlook Classic. After that, everything was working fine until I tried to connect other apps to use Office as default email. Now all my office apps say they will expire in 2 days unless I log on but logon doesn't work. I keep getting hung up on by Machine support and have no access to Engage Center when I go there. Very VERY VEEERY frustrated.

Sivea Key 0 Reputation points

2026-09-15T21:54:01.7533333+00:00

Ignore this

1 answer

Your answer

Sivea Key 0 Reputation points

2026-09-15T21:54:01.7533333+00:00

Ignore this

Answer 1

Chris-D 1,595 Independent Advisor

Hi Sivea,

I’m sorry to hear about the difficulties you have experienced with Outlook and the activation of your Office applications. Based on the Outlook version you provided, it appears that you are currently using new Outlook for Windows rather than classic Outlook.

To assist you more effectively, could you please provide the following information?

Open Word, go to File > Account, and share the information displayed there, preferably by providing a screenshot of the Product Information section, including any activation message shown. Please make sure to hide any personal information, such as your email address or product key.
Under Product Information, select About Word and share the full version and build number shown.
Confirm whether the account signed in to Outlook is the same account you are using to sign in to Word and the other Office applications.
If possible, share the exact error message you receive when attempting to sign in to Office.
Let me know where the Office 2024 Professional Plus license was purchased, such as directly from Microsoft, an authorized retailer, your employer, or a third-party seller.

Please feel free to share the information in the comment below. Once I have it, I'll be better positioned to guide you through the next steps.

I look forward to hearing your thoughts.

Note: Follow the steps in the forum documentation to enable email notifications if you want to receive email notifications related to this topic.

Sivea Key 0 Reputation points

2026-09-15T23:45:23.19+00:00

Thanks Chris! I've spent hours trying to get support directly from Microsoft. Just get the run around and useless links. I can find the Outlook (Classic) and use it from my task bar but cannot find it in Installed Apps in Settings.

Sign in on Outlook (Classic) is RSZ (This is the email I used to purchase the license for Office 2024.)

Word, Xcel, PP, 2024 are LOS ?!

Outlook 2024 is SK ?? (I thought that had been removed by the way and I believe in my confusion about all the Authentication requests just went with the email account that came up with the error)

I bought my license at StackSocial as recommended by PC magazine.

[Moderator note: Personally Identifiable Information removed]
Chris-D 1,595 Reputation points Independent Advisor

2026-09-16T15:34:49.49+00:00
Hi Sivea,

Thank you for sharing the details and screenshots. I can confirm that Outlook (classic) is installed as part of your Office suite, even though it may not appear as a separate application under Settings > Apps > Installed apps. The Outlook app listed there with version 1.2026.902.100 is new Outlook for Windows, which is installed separately.

The “This account is not supported” message applies to new Outlook and indicates that the selected account does not have the required access to that application. Since Outlook (classic) was previously working with your RSZ account, you may continue using Outlook (classic).

You can also set Outlook (classic) as your default email application by going to Settings > Apps > Default apps, searching for and selecting Outlook (classic).

Set it as the default for the available email-related file and link types, particularly MAILTO and .eml.

The Office activation warning is a separate issue. Your screenshot shows that the installed product is Microsoft Office LTSC Professional Plus 2024, which generally uses a product key or another volume activation method rather than activation through an email account alone.

Since the license was purchased through StackSocial, I recommend the following:

Locate the original StackSocial order confirmation and the product key or activation instructions provided with the purchase.

In Word, go to File > Account and select Change Product Key, if available.

Enter the 25-character product key provided with your purchase and follow the activation prompts.

If the key is rejected or Office continues displaying the expiration warning, please contact StackSocial Support with your order details and ask them to verify the license or provide an appropriate replacement or refund.

The different accounts shown across Outlook and the Office applications may explain some of the repeated sign-in prompts. However, changing those accounts alone may not reactivate Office LTSC Professional Plus 2024. The priority is to verify the product key and activation method provided with your StackSocial purchase.

I hope this helps clarify the situation and provides a more direct path forward. If there is anything else I can help with, please feel free to reach out.
Sivea Key 0 Reputation points

2026-09-16T17:27:34.84+00:00

Thank you so much Chris! I finally received a call from MS office support but they only did 365 Office and had no answers. He is trying to transfer to the right team. Meanwhile your instructions on default settings for Outlook are soooo helpful. That's the problem I was running into. I'm working on the rest. Will report back!
Chris-D 1,595 Reputation points Independent Advisor

2026-09-16T19:34:00.9633333+00:00

Hi Sivea,

Thank you for the update. I’m very glad that the Outlook default app instructions were helpful and addressed the problem you were running into.

I hope you are connected with the appropriate support team soon and that the remaining Office activation issue is resolved without further difficulty.

Please feel free to let me know how it goes.
Sivea Key 0 Reputation points

2026-09-17T15:13:28.88+00:00

Not a Microsoft problem it turns out. Received a new license code from SocialStack. Now suspicious that it won't last but that is a SocialStack and me problem not Microsoft. Had no idea PC Magazine would send people down a dark alley. Trying to find a desktop physicial disk solution for the long term. I definitely do NOT recommend people try to buy Office 2024 LTSC of any kind. Of course they don't market it as LTSC. My recent research shows it is NOT a legitimately purchasable license for small business use of one. I rarely fall for scams but . . .
Chris-D 1,595 Reputation points Independent Advisor

2026-09-17T15:40:27.6633333+00:00
Hi Sivea,

Thank you for the update.

I’m glad that StackSocial provided a new license code and that the source of the activation issue has now been identified. Given what happened with the original code, I completely understand your caution about relying on the replacement long term.

Office LTSC Professional Plus 2024 is generally distributed through Microsoft’s commercial or volume licensing channels rather than as a standard retail license for an individual user. However, obtaining Office on a physical disc would not necessarily guarantee that the license is genuine or remains valid, since activation still depends on the product key and the licensing rights provided by the seller.

If you prefer a legitimate one-time purchase for one computer that includes the classic desktop versions of Word, Excel, PowerPoint, and Outlook, Office Home & Business 2024 would generally be the appropriate retail edition to consider for home or small-business use. I recommend purchasing directly from Microsoft or an authorized retailer and keeping the purchase receipt and account information for future installation or activation needs.

For your reference, you may find these articles helpful:

Office 2024 and Office LTSC 2024 FAQ

Office Home & Business 2024 from the Microsoft Store

For the current installation, please keep your StackSocial order confirmation and the newly issued product key in a secure place. If the replacement code stops working, StackSocial would remain the appropriate party to contact regarding the license.

Thank you again for reporting back and sharing what ultimately resolved the activation issue.