When I try to create a service bus topic programmatically using the sample app (https://github.com/Azure-Samples/service-bus-dotnet-management), Azure gives Operation returned an invalid status code 'Forbidden' exception.
I have verified my TenantId, ClientId, ClientSecret, SubscriptionId and namespace name several times and they seem correct to me. My service bus pricing tier is "Standard".
According to the error, seems you did not add your service principal as a role to your service bus.
You could follow the steps:
Navigate to the azure portal -> your service bus or the subscription whcih your service bus located -> Access control (IAM) -> Add -> Add role assignment -> search your service principal with name and add it as a role(e.g. Owner) -> Save.
For more details, refer to this link.
