Microsoft-graph-docs: Impossible to use the Files API with a guest user

[climam]

Issue:

Since very recently, it is not possible to use the Files API with a guest user.
This was working perfectly so far with the graph API. Is it a regression introduced with last release ?

Article:

https://graph.microsoft.com/v1.0/drives/b!tupJ7wMaiEuk8-aRAxLsMihw8n59n7tJpCpPLff9m6wkV5KAl9izQKnS0xXxxsa

{
"error": {
"code": "unauthenticated",
"message": "Role Claim does not exist for Service Asserted App V1.",
"innerError": {
"request-id": "2096c1f4-911f-457a-af24-31e7ba7a86b7",
"date": "2018-06-27T13:55:39"
}
}
}

[climam]

This issue is also reported in stack overflow:

https://stackoverflow.com/questions/51059599/microsoft-office-365-groups-guest-user-are-unable-to-do-drive-call-using-graph

https://stackoverflow.com/questions/51071170/guest-users-get-unauthenticated-when-calling-onedrive-through-the-graph-api

https://stackoverflow.com/questions/51059669/exceptions-in-calls-to-onedrive-graph-api

[jthake-msft]

@daspek do you have any further information on this?

//cc: @JeremyKelley

[climam]

The issue is not happening anymore this morning, do you confirm that you fixed it ?

[JeremyKelley]

We did in fact make a change that should resolve the issue. We apologize for the inconvenience it caused and also really appreciate the info both here and on StackOverflow.