getDirectRoutingCalls return ServiceUnavailable

Question

I am using 2 Microsoft graph API's

1. getPstnCalls
2. getDirectRoutingCalls

I have tested them on my organization, and they are working fine

when I switch to the customer organization getPstnCalls is working fine but getDirectRoutingCalls fail with error ServiceUnavailable

{"error":{"code":"UnknownError","message":"{ \"Error\": 503 }",
"innerError":{"date":"2021-06-07T20:01:20","request-id":
"c0fc172a-7c8e-4bce-8a1e-2b34775478bd","client-request-id":
"c0fc172a-7c8e-4bce-8a1e-2b34775478bd"}}}

Called URl is https://graph.microsoft.com/beta/communications/callRecords/getDirectRoutingCalls(fromDateTime=2021-03-11,toDateTime=2021-06-08)

how can I troubleshoot it?

Answer 1

problem solved by reducing the date range from 89 days to 88 days

date range above 89 will produce this error, smaller date range works fine

Answer 2

• Check in which role you're testing the above call as part of customer org? If there is any differences, make sure you're part of the specific role so that you can perform the above API call or not.
• Also to isolate the issue, see if you can repro the issue using graph explorer or POSTMAN for the above tenant.