@predrag thank you for your assistance, this has partly solved my issue.
I can now access the back-end again, but if I activate 2FA, without forcing it to the users, I’m not able to generate a QR code.
I installed Defender on another site, where it does work.
https://ibb.co/4ZtrXKv
Defender v 2.4.5
Wordpress Version 5.7.2
But on the current site I’m working on, it doesnt work.
https://ibb.co/LpvXXy3
Defender v 2.5.3
Wordpress Version 5.7.2
Hey kris, sorry for the delay in answer.
Unfortunately, I’m unable to navigate to defender which I stated in the original post.
If I rename the defender folder via FTP, I have access to my entire site. If I reïnstall Defender from the WordPress store the profile page is the only page I can visit.
I think this has to do with the fact that I forced MFA to all users.