Can’t access Network Admin dashboard in wp-admin

Access your plugins folder via FTP or your Hosting cPanel “Files” program. Rename the offending plugin folder to something else. That will effectively disable the plugin. (If locally hosted, then change the folder name that way.)

I don’t usually change the settings in the wp-config.php file, so you may want to put those back to original.

Then use your phpMyAdmin program (via your hosting Control Panel if needed, or your local equivalent if locally hosted) and access the wp-options table. There are two locations in there for the site ‘home’ URL. Change both to the same value (to https://mysite , if I go by your example)

That should allow you to get back into the admin area, and you can go from there.