configd.log error - "useradd: invalid user name 'xxx'" and "Authentication profile not found for the user"

• PAN-OS upgraded from 10.1.x to 10.2.x
• Local admin users with only "numbers" in the username can no longer login to the GUI
• System logs (show log system) display failed authentication messages

failed authentication for user \'12345678\'. Reason: Authentication profile not found for the user. From: x.x.x.x.'

• When trying to re-add the user, configd logs (less mp-log configd.log) report "invalid user name" message

useradd: invalid user name '12345678'
usermod: user '12345678' does not exist
Error:  pan_cfg_user_create(pan_cfg_users.c:1191): User account for user 12345678 was not created

• Palo Alto Firewalls and Panorama
• PAN-OS 10.2.x and above
• Administrator usernames

1. Change the local admin usernames with only numbers to usernames that contains letters or letters and numbers.
2. Commit the new configuration.