Invalid username

Hello everyone, how are you?

I have installed All In One WP Security & Firewall plugin, and activated a series of security options recommended by the app. The “forced exit” option was NOT ckecked.

Anyway, if I log out of the panel and try to login again, wordpress doesn’t find my login credentials and when I ask to send an email to reset password it also doesn’t work because it can’t find my registered email on their sysyem. I tried with other registered usernames and it is the same problem.

I already deactivated the plugin via FTP to have access again, and it worked again, but I would like to know which option inside the app is making this happen so I can deactivate it.

Any help would be amazing, thank you!