Thanks for getting back to me winkklashes-19.
Currently, only accounts which are subscribed directly to Intuit have the feature to invite and accountant user to their books.
We can offer a billing migration which involves switching your billing from Google Play to Intuit, so that you then have access to this.
To do this, you'd need to cancel your current subscription with Google before your next usual bill date, so we can proceed with moving you over.
Get back to us if this is something you'd like so we can raise a case for the migration on your account.