Degradation in the Service

Same here

Yep, I am also expereincing issues like this with dataflows and gateways at the moment

Not sure if this is related to what you are seeing, but Microsoft is reporting authentication issues

Please see https://status.azure.com/en-us/status

Same here - Premium capacity - dataflows are disabled - cannot refresh dataflows - cannot refresh datasets - 

cannot open reports in web service - both admins and members cannot view reports

Here is an error message:

Hi RichieRich  

You could try the following steps:

1.Save the users in the list somewhere.
2. Remove all of them from the shared list and only add owner himself.
3. Update the app. Expect to success.
4. Add users back manually, duplicate and invalid user will be reject.
5. Update the app again.

If the issue still occurs, please check if the customer locks down permissions on their AAD tenant. Please make sure enough permission is granted to access AAD. It's required to validate the users on the access list.
For more information, please check https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/plan-conditional-access

 More details click here

And our problem may be related to the Azure AD problem Microsoft is having right now.
https://community.powerbi.com/t5/Desktop/OUTAGE-ALERT/m-p/1723461#M680824

Wish it is helpful for you!

Best Regards,
Lucien