Synapse serverless shared database and tables access for non sysadmins

I'd like to share my reason for ending up with the 

External table 'permissiontable' is not accessible because content of directory cannot be listed.

error message.

I was doing some experimenting with CETAS and it worked perfect on Friday, but I did receive the error above on Monday.

Did a lot of "Add IAM role" with no luck whatsoever. 

Then it finally hit me - I had used a very short timespan on the SAS-creation step.

My actual Database scoped credentials token was no longer valid...

CREATE DATABASE SCOPED CREDENTIAL enriched_openaid_credential
WITH IDENTITY='SHARED ACCESS SIGNATURE',  
	SECRET = 'sv

Since this was just a test session I deleted the old credential and created a new one with a better SAS timespan.