In the Map Viewer Classic, my table data shows up, but in the New Map Viewer the table is completely empty, however the content of each field will show in a pop-up and will show if I configure a label.
The table I'm trying to use is added to our AGOL content, it is a feature service in our GDB made from a PostGreSQL View in Amazon Aurora. It does require login using our active directory credentials, but that seems to be working. It prompts me to login when I access it.
Are you able to check the developer console and see if any errors come up?