Get Error When Access Secured AGS Feature Service from AGOL

Question

I created a secured feature service via ArcGIS for Server and then added it as an item to AGOL. This service is used by Survey123 using the submission url parameter. I was able to access this service from AGOL over the past year successfully. Just recently, I went  to access the service url from AGOL and now get the error below. I am able to access the service just fine directly from ArcGIS for Server, just not from AGOL. Could a recent AGOL update have affected this functionality? Our client is also getting the same results from his AGOL organization. We have not changed this service over the past several months.

Error

Services Directory has been disabled.

Error: 403

BigLouC · Answer

Bringing this back to live. Was there a solution? 5 years later, I am getting the same error.

Rodriguez_Carlos__ITD_ · Answer

We are also having this issue. We have a secured service hosted on a local 10.7 ArcGIS Server, we created a feature layer in AGOL pointing to a table in the secured layer with the credentials stored in the AGOL item. We are trying to query the table using rest and get the same error mentioned above.

KellyGerrow · Answer

Is this item shared publicly or are you appending a token/logging in with your ArcGIS Online credentials when you try to access the service? Does this still work in a web map in ArcGIS Online?

-Kelly