This account is not supported in Outlook for Windows due to the license provided by your work or school

I have a licensed version of the Outlook desktop app supported by an E3 license, and another Outlook account under an E1 license. This is what worked:

1. Switched to new Outlook. Received an error accessing the E1 account.
2. Removed the E1 account.
3. Fiddled with adding this through IMAP. This is either not implemented or nerfed.
4. Switched back to old Outlook. E1 account reappeared/was retained.
5. Switched back to new Outlook. Everything works.

In my case, "turning it off and turning it back on again" worked. SMH. Not sure if this will stick or even work for everyone. And I suppose the fact that the software configuration does not, but better or worse, behave consistently is a HUGE red flag.

I just tested this to see if was working yet and it did. I installed New Outlook on a clean machine, Outlook for Windows - Microsoft Apps. I then made the first account an Outlook.com account not tied to any license. I then tried to add an M365 Kiosk account and it failed with the error:

"This account is not supported in Outlook for Windows due to the license provided by your work or school. Try to login with another account or go to Outlook on the web."

I then added my Outlook.com account that I have M365 Family Subscription, and then made it the primary account in the profile. After I did that, I was then able to add the Kiosk account in the profile. Since the change was just rolling out you might not have had it yet. Please give it a try again once you get a chance.

To all those who are experiencing frustration, please remember that Microsoft isn't really in this thread. They are over here:

https://feedbackportal.microsoft.com/feedback/idea/2f7925cb-3a80-ee11-a81c-000d3ae46fcb

Please take a moment to upvote that issue, and add your comments there. That way the issue is brought to light, and to the forefront of attention for everyone, including Microsoft.

As a personal aside, it's disappointing to see in some of these threads the misleading information that's being posted. Perhaps these individuals think they are helping, but as the two most recent posts above this reply highlight, the problem is not solved, and any solutions proposed by anyone thus far are either unworkable, or only address a small edge case.

Windows has always included a free email client. These smaller paid accounts have always been usable in those clients. In new Outlook, they're simply not. That's it! That's the issue.

https://feedbackportal.microsoft.com/feedback/idea/2f7925cb-3a80-ee11-a81c-000d3ae46fcb

Please, everyone, go upvote the core issue linked above. Get your friends, your co-workers, your bosses, your employees, get everyone to upvote and comment on the Feedback item. That is the only effective way to get Microsoft to see and understand the scope of their decision's effects on the world.

Thanks,

Glen

People, you are wasting your time.

Microsoft have you by the short and curlys and they know it.

Subscription price of business basic went from £3.80 (GBP) to £4.50 then to £4.90. now they are forcing 12 month contract unless you pay another 20% making it £5.88. same percentage increases on other packages. If you are a partner (reseller, even just a small indirect reseller) then they come after you if your client goes bump. The partner is on the hook for paying out the rest of the contract.

At the same time, they are forcing you to have licenses that you don't want, as in this very discussion here, and also in the case of office apps (word/excel) being signed-in to a secondary account that has business basic - accessing files on OneDrive for example. They are forcing you to pay for the full license for every single account even if all on the same computer and the same person, and at these massively inflated prices.

And the problem is.. there is no negotiation. You have no voice at all. It's take it or leave it. Google aren't any better really.

It's time to ditch them altogether. Go back to basics. IMAP mail or SoGo or something, libre office, back up your data with Kopia and Backblaze instead of OneDrive. Just say NO.

Well said Carl, 100% spot on.
I have a dozen customers who would run away from Microsoft if they could break the chains.

MicroShaft think they are like the government and us peasants have to tithe to rent our 2 acres of land.

The irony is the products are getting worse and worse with each iteration.

Tried the "new New NEW Outlook" OMG what an ABOMINATION, an entire department needs sacking for ever thinking this was a viable product.

But I've been in this game long enough to see giants fall, remember IBM, DIGITAL, Honeywell, Alta Vista, Jeeves, Lotus, etc.

People, you are wasting your time.

Microsoft have you by the short and curlys and they know it.

Subscription price of business basic went from £3.80 (GBP) to £4.50 then to £4.90. now they are forcing 12 month contract unless you pay another 20% making it £5.88. same percentage increases on other packages. If you are a partner (reseller, even just a small indirect reseller) then they come after you if your client goes bump. The partner is on the hook for paying out the rest of the contract.

At the same time, they are forcing you to have licenses that you don't want, as in this very discussion here, and also in the case of office apps (word/excel) being signed-in to a secondary account that has business basic - accessing files on OneDrive for example. They are forcing you to pay for the full license for every single account even if all on the same computer and the same person, and at these massively inflated prices.

And the problem is.. there is no negotiation. You have no voice at all. It's take it or leave it. Google aren't any better really.

It's time to ditch them altogether. Go back to basics. IMAP mail or SoGo or something, libre office, back up your data with Kopia and Backblaze instead of OneDrive. Just say NO.