Symptoms
Office365 import procedure (Importing Tenant Subscriptions from Microsoft Cloud) fails with the following error message in the sitelog:
Received error response 403 Forbidden:
{"code":"1002","error_code":"Forbidden","object_type":"Error","message":"Reseller CAID does not have a reseller relationship with customer CAID."}
Also, readCSPAccounts.py returns empty output files.
Cause
Incorrect Partner relationship between the reseller and its customers on the Microsoft Online Portal side. Check the MOP > Partner Center (tile) > Customer Admin Center > Users (left menu item) > Partner Relationship value. readCSPAccounts.py expects Cloud Solution Provider relationship type, but it is Advisor in our case.
Resolution
Change the Partner Relationship type to Cloud Solution Provider, using the invitation link on the Microsoft Portal and repeat the import procedure.