Error 400: redirect_uri_mismatch when authorizing through Google - how to fix it?

Question

Google

I installed the comments plugin on my site. It has an option to sign in with Google, but in order for it to work, it was necessary to dance with a tambourine according to the instructions on the developer's website. I did everything exactly according to it, but in the end, when I click on the button to enter through Google, an error pops up:
"Error 400: redirect_uri_mismatch
The redirect URI in the request, https://anti-mif.ru/index.php?option= com_jlexcomme...
does not match the ones authorized for the OAuth client. Maybe the instructions are outdated and it was necessary to do something differently?
Website: https://anti-mif.ru
Plugin: JLex Comment
joomla 3.9.19

Answer 1

achieve the sameness in the admin panel and in real life, step-by-step and protocol-by-protocol
, taking into account redirects