There is new text that has been added in the Google Business Profile Help Document that says new managers and owners have a limitation where they have to wait 7 days before then can manage their profiles.
Here is the text on it:
Understand new owner & manager limitations
When a new owner or manager is added to an existing Business Profile, they must wait for 7 days before they can manage all the features of the profile. During this 7 day period, the new owner or manager gets an error if they try any of the following:
If the new owner or manager deletes their account within the first 7 days, they’re removed from the profile. If they undelete their account, they must be added to the profile again.
It is said that this 7-day waiting period is a new security feature of Google Business Profiles.
When adding new access to the profile, it is best to consider this waiting period and to inform your clients or additional users, and plan around it.