Microsoft Teams Not Connecting to Server: Practical Fixes - Resolve Error 0x80073b01 in Windows Defender-Fix 502 Bad Gateway in Windows Defender Sync
Before changing system settings, save your work and note the exact error text so you can compare results after each step.
Extra verification checklist
- Restart the affected app after changing permissions or configuration files.
- Test the same workflow in a clean browser profile or a temporary user account.
- Compare the result on another network if the error may be connection related.
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