After V56 "Unknown Sources" tab is missing

I have a Developer's account "verified" with my ID and business name. I have developer's mode turned on, in the Quest app and the quest 2. Yet the "unknown sources" tab is gone after v56 installed and therefore I cannot test/run any non library software. My apps are installed because I can see it them in the files app. but no way of executing/running it.  Has anyone solved this? How to turn on the "unknown sources" tab under the app library.

I have been asking for help for a couple of weeks, but I keep getting the wrong tech support answering my enquiries asking me to contact developer's support.