I guess / think you are on a dev build on Android 11 (R) {1]
If this is the case OTA Upgrade of Android version [2] is not going to happen! .
Edit perhaps yo can confirm if this is the case …
[1] [HOWTO] Give complete /e/OS version info easily for support, answers, comparison etc
[2] e/OS + Android OS version names and numbers? - #3 by aibd