I want to use the service account on about 50 devices. Can they use the same service token? Is there a limit to the number of service accounts? Does each service account count as a user as far as billing?
You can! There isn’t a limit and it would count as one single license for all 50.
The real challenge here is that you will not know which of the 50 service accounts is accessing what from an audit standpoint. You will also be giving all 50 service accounts the same access to the same resources. There are also no posture checks for service accounts nor MFA of course.