The logs will tell you about the reasons.
In browsers
In MT4
Your Community tab login is tanmoysom because the link to your profile is https://www.mql5.com/en/users/tanmoysom
This is my Community tab login in MT4 -
Forum on trading, automated trading systems and testing trading strategies
On File Menu am unable to Login to Community from MT4
Sergey Golubev, 2020.03.15 05:36
"Login to Community from MT4" is the login to Community tab of metatrader 4?"authorization failed" issue?
As to error 403 - read this summart post in blogs (where I described all possible reasons of this error 403 in Metatrader):
https://www.mql5.com/en/blogs/post/753357
https://www.mql5.com/en/blogs/post/753357

Summary: Installation Failed - Error 403 and more
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Any known reason & Solution??
Thanks in Advance..