teams not connecting to perfect Internet availability

Teams won't connect to a perfectly well functioning Internet

This has been asked before by many other users but I have yet to see something that works on my PC

Clearly there is something strange in Teams that causes this issue so widely.

I have three PC's on a LAN where 2 of them have a working Teams App. The third which is running internet apps perfectly well has an installation of Teams that won't connect.

I have looked at many other users who have complained about this error yet there does not seem to be a solution that generally works. I have spent several hours trying many of them out unsatisfactorily

So I am left wondering why Teams is so finicky. For a product that is so widely used how can this problem crop up for so many people? It would seem that there is some bug in this software that needs fixing.