I am having trouble updating an existing hosted feature service in AGOL. When I attempt to publish, I get the following error message:

"Packaging succeeded, but publishing failed. Failed to execute (UploadServiceDefinition)."
When I go to results, right click the failed process, and click open, I see that the service definition file seems to be missing.

Has anyone run into this issue and how can I resolve it?
Thank you for any help or pointers in the right direction!