Luckily, it is only with one user.
But unfortunately still does not fix it when using incognito
Hi there,
As an administrator, you can update user details only for users whose domain is owned by your organization. You cannot modify user information for domains that are trusted but not owned by your organization. The following details can be updated for a user:
>User Groups and Products assigned to them
>Administrative rights
>Country
For more information, please refer to this article: https://adobe.ly/4gBOtSV
If you assign a Product Profile to a user, they will receive an email notification to complete their profile. Since this issue is isolated to a single user, I recommend checking whether the email address is already associated with another user in your system, possibly with a different last name.
Let us know if this helps.
Thank you.
Regards,