Error Code - caa30193

[maliksi-merabet]

Hey together,

me and some of my colleagues are using MS Teams with a guest access of one our partners. Since the beginning of this week we can neither log-in via Web nor via App. The app always shows the error code "caa30193". When I try logging in via Web, I receive Error 403 (Forbidden). 
Partner already tried removing us from the chat and adding us again, but we still cannot log-in. 

Can anybody tell me where the source for this error message lies and how to fix it?

Best regards,

Malik

[#2]

@maliksi-merabet 

CAA30193 indicates Teams received an error from the machine’s HTTP stack when attempted to navigate the browser to a page. This can indicate the presence of a proxy, firewall, network issue, or something similar preventing from connecting to service.

[#3]

What's the solution ? There is any way to debug this ? @Tushar Pathak