sign in trouble for months...

Same problem for months now. Cannot sign in - I have used the correct password and have signed in successfully on other MBP’s. The “please check your network connection” message always shows, although I am able to use the internet and everything else with no problem. Also, I can’t uninstall? Before when I had this problem, I would un/reinstall and things would work. However I can’t do this anymore.

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