I have to figure the underlying reason is that Google can't trust that you, the user, own that Google Account as it actually owned by the entity that owns the GSuite organization. They are treating all GSuite users as transient in order for controls to be set up for what happens to user data when they leave the organization.
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.
Even if you set aside those legacy G Suite accounts, this is still also a problem for any business on a current paid plan. Nest even advertises their products to businesses here: https://nest.com/nest-for-business/
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.
This is one of the key points that got me to start looking for other solutions, I have a single gsuite account for everything and they are forcing me back to gmail since they can monetize the account data that way
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.