Thank you, but that’s not the problem. There is the point “Access code for maintenance mode”. How can I set this? If I do it like in the example, nothing work. I need access as a visitor when the maintenance mode is active. I want to test some things.
Thank you for clarifying. Please update access to the admin panel https://prnt.sc/xB1BnvtRkvfJ so I can investigate it.
Also, confirm the permission for plugins deactivation, and switch to the parent/default theme. As soon as we complete the testing we will enable all back, You would better make the full backup of your site