Premium Capacity users cannot add new content to workspaces or export underlying data from visuals

Hi all,

Some of my users are reporting that the "Get Data" and "New" > "Upload a file" functions in their Power BI workspaces are not working. Button clicks do nothing -- no user error or browser console message. All complainants have the Admin role in their workspaces. They can log in and view their reports normally, however, they cannot export underlying data from visuals at all, even though they should be able to. 

This is on a Premium P1 capacity with users who are AAD B2B member accounts. When loading the workspace, the browser console shows 404 errors on calls to https://wabi-canada-central-redirect.analysis.windows.net/powerbi/metadata/refreshusermetadata, and https://wabi-canada-central-redirect.analysis.windows.net/powerbi/resource/userPhoto/?huid=-1380330474. 

I've checked the tenant and capactiy admin portals and not seen anything obivously wrong.

Anyone else seeing something similar?

Thanks,
Craig