Could you please tell me if you can join the meeting by using the privacy mode of the browser. If you are in incognito mode, please try to exit incognito mode. Or have you tried to join the meeting using the Teams client to see if you also encounter this problem.
Please try to clear the cookies of the browser and then add Teams as a trusted site. For example, the operation in Edge is:
- In the Edge Settings window, select Cookies and site permissions > Cookies and data stored > Manage and delete cookies and site data.
- Turn on Allow sites to save and read cookie data (recommended), and make sure that Block third-party cookies is turned off. Alternatively, if you have to keep third-party cookies blocked, do this instead in the same window: Under Allow, select Add to add the following sites:
- [*.]microsoft.com
- [*.]microsoftonline.com
- [*.]teams.skype.com
- [*.]teams.microsoft.com
- [*.]sfbassets.com
- [*.]skypeforbusiness.com
For other browsers such as Chrome, please refer to this reference.
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