Teams web client is stuck in a login loop

[AtanasM]

Teams web client in Windows is stuck in a login loop on many different browsers and asks to allow the cookies of 3rd party apps, event they are allowed and the related links are already added in the browser.
The issue exists also in In-Private window and other networks. No additional antivirus program is used.

[#2 · Accepted solution]

@AtanasM 

Since the community has not yet responded to your post, you might want to seek assistance with other resources that are staffed by authorized Microsoft agents:

• Ask your IT manager to open a support case or call Microsoft using the support line you were given.  Other options for business subscription admins are listed here:

Get support | Microsoft Docs

https://support.serviceshub.microsoft.com/supportforbusiness/create

• Additional tech support is available at support.microsoft.com or Answers.microsoft.com, where authorized Microsoft agents are available to offer support until the issue is resolved.