I have Exchange on premise and Office 2019 installed in PCs. In Outlook 2019, when someone open outlook, after some second, they always ask for Login to Microsoft website. If I close this, it's not works any more. I checked Server is up and fully working. I removed user profile from Laptop and added again, but still happens same. Furthermore, I changed Trust centre setting, but still they ask. Its happen in multiple PCs. If anyone have any clue about that, Please let me know. I added screenshot also. I tried all solution from MS website, but not working.enter image description here
Please open the registry setting on Outlook client PC. please add the following registry key to this location HKEY_CURRENT_USER:\Software\Microsoft\Office\16.0\Outlook\AutoDiscover DWORD: ExcludeExplicitO365Endpoint Value = 1
If AutoDiscover doesn't exist, Please add a key by right click on outlook (HKCU:\Software\Microsoft\Office\16.0\Outlook) and add a Key with the Name "AutoDiscover". Once you add that Key, click to add Dword (32Bit ) value. Click modify and add name ExcludeExplicitO365Endpoint and add Value 1.
Now they will not ask for passwords again. If it still happens, Please restart your PC. I hope its work for you
