Fails to Create New Topic - `409 (Conflict)`

[ilivewithian]

Running the command

dotnet pat create -n mailmachinegun-ns -s MySubscription -t robtest

fails with the output

Authenticated as <Obfuscated Guid>
Response status code does not indicate success: 409 (Conflict).

If the topic is manually created the subscription is correctly created.

The authenticated principal does have permission to create topics on the azure service bus.

[ilivewithian]

I have been unable to recreate the issue. The same commands are not resulting in error.

I'm still acting as the same user.
I have not been asked to reauthenticate.

The command succeeds.