Discovery Subscriptions from Azure Service Principal failed.Issue Discovery Subscriptions from Azure Service Principal failed with below error: REQUIRED_ATTRIBUTE_EMPTY Missing mandatory field [serial_number] in table [cmdb_ci_azure_subscription]. Add input value for mandatory field in payloadReleaseParis Patch 1 Hot Fix 5CauseUpon reviewing Discovery logs we can see the error is from Identification engine. identification_engine : logId:[0702af5c1b4d6c503341dc26bc4bcb48] Output = {"items":[{"className":"cmdb_ci_azure_subscription","sysId":"Unknown","identifierEntrySysId":"Unknown","errors":[{"error":"REQUIRED_ATTRIBUTE_EMPTY","message":"Missing mandatory field [serial_number] in table [cmdb_ci_azure_subscription]. Further checking Dictionary Entries on "cmdb_ci_azure_subscription" table found serial number is set Mandatory = True. However, OOB serial number is NOT Mandatory on "CMDB" and "cmdb_ci_azure_subscription" dictionary entires. ResolutionOOB (Out of Box) serial number is NOT Mandatory on "CMDB" and "cmdb_ci_azure_subscription" dictionary entires. Hence, upon unchecking Mandatory field discovery subscription is successful.