Hello S123 Team,
It appears there's a bug/issue with adding Dynamic Choice Lists from AGOL Hosted Tables when the table is standalone in the service (without a point feature layer)
When adding a layer for the Dynamic Choice Lists it says it accepts "Feature Layer or table" but when adding a service with a standalone table in it the results are empty:
Adding a layer for a dynamic choice list:

Searching for the hosted table, no result:

The service:

Please let me know if you need any additional information.
Thanks,
Amanda Huber