Not Able to update ObjectKeyManger field of AADUser for Few users. Not able to update Azure AD Manager field . ObjectKeyManger is grayed out for some user which are not even outstanding.

For few Azure AD Accounts XmarkedforDeletion =0

User's of Usertype = Guest in AzureAD -> I am not able to update the 'ObjectKeyManger ' (Display Name = Account Manager) column from Manager tool. It is grayed out.

When I open the Table object in Object browser and see properties :

I can see CanEditDisallowedby   = O3E.Customizer.AADUser  for those users.

NOTE:  I am able to update all attribute of other users of AADUser where UserType <>'Guest'

NOTE: I am able to update other properties of same user where I am having Manager field as Grayed-out issue.

  Please suggest .