The account migration stuff is just confusing - "You must log in with your google account!" "No, not that google account, you can't use that!"
Of course, for you and me and hundreds of thousands of other who use a grandfathered GSuite, the user and entity are the same person.
Thus, for services that potentially have some limiting reason to not allow GSuite users to access, we hare orphaned for the time being.
I've been waiting FOREVER to either add a family member to my Play Music subscription, or me to theirs. Alas, neither plain Google Account nor GSuite account can co-exist.
There are dozens of other Google services incompatible with GSuite users.
It is frustrating.
However, they fail to tell you that your company will be unable to use it with G Suite. There's nothing the administrator of the G Suite account can do either.