Adding Email Aliases - You don't have permission to perform this action

Adding Email Aliases - You don't have permission to perform this action

Hi,

I am super admin of my organization. The target user is an admin.

- I can't add a new alias to a target user's email.
- I am able to delete user aliases for the target user.
- I tried to add the desired alias to me user, that worked. Then I tried to transfer the alias to the target user, and again "You don't have permission to perform this action"

What could be the cause and what can I do?

Thanks,
Paul