Hi,
Yesterday a number of feature layers hosted on ArcGIS online stopped being able to be loaded into ArcPRO.
Whenever I open a APRX that references these layers I get the red "!" and if I try to repair the data source nothing happens.
If I try to add the data manually it ask me for my server credentials, if I put them in and select OK the window just reappears. If I press cancel I get the "Failed to add data" error.

In addition I can load these data sets fine into ArcMap but not Pro.
Does anyone have any ideas that might cause this sort of error?
Thanks