Where did you get the Orbot apk from?

Most likely the signing key, which is why where you got the APK matters. Molly doesn't just check that the package org.torproject.android exists. In OrbotHelper.init() it only accepts Orbot if the APK is signed with one of two keys: the Tor Project's or f-droid.org's. If Orbot comes signed with any...

Two usual suspects on GrapheneOS: 1. Profiles. If Orbot lives in a different user profile (Owner vs. a secondary profile), Molly literally can't see it. Each profile is its own app space. Install Orbot in the same profile as Molly. 2. Package detection. Molly's Orbot toggle depends on querying Orb...