As our forum only supports for English, could you help us to translate the error message on the top of the image provided by you?
What changes do you do before this issue happened?
What kind of network do you use? VPN, Wi-Fi, Ethernet?
Someone meets with this kind of issue for compatibility, you could try to go to this path: %localappdata%Microsoft\Teams\current\Teams.exe > right click Teams.exe and choose properties > in Compatibility tab, check “Run this program in compatibility mode for Windows 8”. Then, restart Teams and try again.
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