anybody got any idea about this please? I manually created a service principal for pulumi to run as, it's got all the permissions i can find but i get this when i try to create a new SP with pulumi

SP creating error: Plan apply failed: graphrbac.ApplicationsClient#Create: Failure responding to request: StatusCode=403 -- Original Error: autorest/azure: Service returned an error. Status=403 Code="Unknown" Message="Unknown service error" Details=[{"odata.error":{"code":"Authorization_RequestDenied","date":"2019-03-25T14:22:29","message":{"lang":"en","value":"Insufficient privileges to complete the operation."},"requestId":"6df1d82f-17bb-48da-94d7-8dd03e6a39fa"}}]