Provisioning subscription task fails:
"code": 500, "message": "Unauthorized", ... "error": "ApplicationUnknownError", "http_request": "POST /O365App/aps/subscriptions"
[ 115] DEBUG flow: Creating subscription: bd938f12-058f-4927-bba3-ae36b1d2501c -> 1. [ 115] ERROR flow: Caught unknown error: Code: '0' Message: 'Unauthorized'
Subscription in question is related to the Tier-1 CSP partner Reseller which has his own Application Instance.
Redundant MPN ID is configured for the Reseller on the BA side.
Tier-1 resellers should not have a MPN ID assigned. Remove it in the:
PCP > Billing > Resellers > [Affected Reseller] > Additional Information (tab) > MPN ID (field)