Unable to Open Attribute Table, "Data Error"

[Anonymous User]

Hi y'all,

I'm unable to open an attribute table of a feature class within a WFL I opened in ArcGIS Pro. When I try to open it, it gives this pop up "Failed to load data. Error Code 400, Bad syntax in request." I'm not sure what is going on but it seemed to happen out of nowhere. When I tried to access the table online, that table failed to load as well. Now every copy of that data layer is behaving the same way. I couldn't find any other documentation online as to why this is suddenly failing.

Pop-ups are not working as a result, but I know the data is still there because I was able to apply accurate labels and I can see and edit the table fields. 

I have tried removing the layer, opening and closing the project, opening the specific feature class in other maps (desktop and online), exporting it to my local device and reuploading, exporting it as a file geodatabase and changing the data source, accessing from other devices and accounts, but to no avail. 

Please help, I've cross posted in ArcGIS Pro! I'm afraid I've lost this data...