When assigning single digit Extension for Users in Configuration Manager, It says minimum required length of Extension is " 2 ".
- Configuration Manager
This is an intended behavior noticed currently in Configuration Manager that even though Extension Length in Sites is set to 1 and when assigning single digit Extension for Users, It says minimum required length of Extension is " 2 ".
Any Users who have Extensions assigned in single digit might have been set while they were in Account Manager and got migrated now to Configuration Manager platform with the same. If those extensions are edited now, it not possible to revert back to single digit extension currently.