How to unblock a blocked user account on WordPress?

To unblock a user, you need to visit User Blocker » Blocked User List page in your WordPress admin area. You’ll see the same 3 tabs as above with the list of blocked users categorized accordingly. There’s an additional Blocked User List tab that shows the list of blocked users from all 3 categories.

You can go to Blocked User List tab and click on Reset option below each user to unblock them.

Once reset, the user can login to their account normally.

Article: How to block users without deleting WordPress users?