Outlook 2016 or 2021 and On-Premise Exchange 2016 - Get Add-ins button keeps redirecting to https://appsource.microsoft.com/.... instead of dialog window

Thomas Timmann - TTSYS 5 Reputation points

Outlook forum suggested me to ask the question here.



On-Premise Exchange 2016 CU23SU6 - ver. 15.1 (Build 2507.6)

I'm trying to install several add-ins like Teams/Zoom/Appear.in and so on to Outlook 2021 Professional Plus - fresh install.

When I hit the button "Get-Addins" it redirects to a website https://appsource.microsoft.com/.... instead of the expected dialog window where you have "My add-ins and "Admin-managed"

Add-ins Dialog windows
User's image

Having an old Installation on another laptop that does what I expect, but all new attempts on my new laptop redirects to the website.

  • Same mailbox - same setup

When trying to install the fx- Zoom add-in or others - they ask for credentials for a Microsoft Account (which I had to create) and then re-directs to Office 365.

We do not have Office 365 nor do we wish to have - We have our own On-premise Exchange server and would like to keep this with no integrations to 365 what so ever.

In the EAC it also redirects to the same website, I recall it didn't act that way a few CU's ago

I've tried to install add-ins from EAC - it also redirects to https://appsource.microsoft.com/...

Any clues - Regedit-fix or any ??

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