Cannot activate Office Apps with High Sierra

Hello,FFS MS

Welcome to the Microsoft community!

I have realized that your issues.

Before that, I would like to ask you for some information to better address your question.

 Your High Sierra seems to be a very low version, what is the exact version of your current macOS?

The latest version of Office can only be activated on the three latest versions of MacOS, and cannot be activated if the version is too old.

Compare All Microsoft 365 Plans (Formerly Office 365) - Microsoft Store

If you don't want to change devices, I suggest you download an earlier version of Office from that site and try to see if you can activate it.

Update history for Office for Mac - Office release notes | Microsoft Learn

Also try it with the license removal tool, if it still doesn't activate, there's nothing you can do about it.

1. Download the license removal tool.
2. Open the pkg file in your Mac's Downloads folder.

 3. Select Continue and follow the prompts in the setup wizard.

4. If you want to start removing the licenses, select Install. You may need to enter the password for your Mac's local administrator account.

When the licensing tool is complete, select Close.

5. Now open an Office app and sign in to activate with the email account associated with your Microsoft 365 for Mac license. If you're working on troubleshooting, you might need to reinstall Office before you sign in.

Once you have activated the product, restart the computer and you can get back to work.

For more information, please visit this website: How to remove Office license files on a Mac - Microsoft Support

Feel free to post back if you need further assistance. 

Thank you for your understanding and patience and I look forward to hearing from you.

Ryan - MSFT | Microsoft Community Support Specialist

Hi Ryan,

Thank you for your prompt response. I have used the license removal tool and re-installed Office but when It try to activate it, I get a blank screen at the point where I should enter in my account password. My OS is High Sierra 10.13.6 and I have an Office 365 subscription.

Hello,FFS MS

Thank you for your reply.

 Are you currently unable to enter your account password no matter what you do? What is your current Office version? Have you downloaded an older version?

As your current Mac OS system is too old, it may cause some problems in the process of using it.

Feel free to post back if you need further assistance. 

Thank you for your understanding and patience and I look forward to hearing from you.

Ryan - MSFT | Microsoft Community Support Specialist

Hi Ryan,

 I can log into my Microsoft account without any problems from a browser, email or Onedrive. The Office version I have downloaded is 16.43 (I have tried 16.41 as well). The download and installation process seems to go perfectly. However, when first opening any App, I get the welcome screen and then a screen to enter my account ID. That seems to be accepted but then, when I expected to enter in my password, there is just a blank screen that doesn’t change. I have an Office 365 subscription and my internet connection is good. High Sierra 10:13.6 is, I know, old but my Macbook Pro is also old and cannot take later Mac Operating Systems. It seems a shame to have a laptop that is perfectly serviceable but cannot be used for Office apps.

I am also having the exact same problem. Is there an answer to this, or are we now no longer able to use Office programs with Mac OS 10.13.6?