Event Hub Get Status with REST API - 401 Unauthorized

I am attempting to use the REST API to get the Status of my event hub but it is returning "401 Claim is empty or token is invalid".

Using the C# example here: https://docs.microsoft.com/en-us/rest/api/eventhub/generate-sas-token#c I can build a SAS token for a POST

POST https://my-hubnamespace.servicebus.windows.net/my-eventHub/messages

And this works - 201 returned

Using the same SAS token I call:

GET https://my-hubnamespace.servicebus.windows.net/my-eventHub

401- Claim is empty or Token is invalid

What Claim is it referring to? I can't see any errors in my Portal.

How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum