Dont matter what URL the user tries to access the forum, the page is always xxx.com/register/?do=validating with the message: "Your account does not require validation"

Theres no restrictions to the user account. This only affects ONE user.

Dont know what else to do.

Does this happen if he tries a different browser?  Does this happen if you login as him from the ACP?

 

Does this happen if he tries a different browser?  Does this happen if you login as him from the ACP?

Hello. Yes, the message stays if he changes the browser or I login by the ACP.

The only different "variable" here is that the email address of the problematic account was previously registered with another account (but the account with that email was deleted).

And just to confirm, this still happens when all third party plugins and applications are disabled?

 

And just to confirm, this still happens when all third party plugins and applications are disabled?

Yes.

Check for that member ID, then open core_validating table. Find that member and remove row. Then open core_members and find that member info again. Edit and empty whole members_bitoptions. You may lost other informations from that field, but most important is to unlock member account. 😉

This isn't best method to achieve what you want, but should work.

 

Check for that member ID, then open core_validating table. Find that member and remove row. Then open core_members and find that member info again. Edit and empty whole members_bitoptions. You may lost other informations from that field, but most important is to unlock member account. 😉

This isn't best method to achieve what you want, but should work.

It worked. Thank you!

If this helps others: there wasnt a core_validating row in my case, just had to replace members_bitoptions value by a 0.