While unexpected behavior from your devices surely are annoying - please keep a friendly tone to eachother.
For this particular issue, thank you @mastervishikh
for your assistance.
In a default state - if you have never signed up for Google Lens terms of service, upon first start our Camera app will notice you to sign in to your Google account. What it perhaps could spend a few extra rows is to add in 'Lens' (as that may or may not be immediately obvious).
Upon entering the Lens app for the first time, there is a Google popup asking for approving the terms of service - after which pressing OK, 'Google' will ask for permissions to access camera - as it should.
It is likely, at some point, in this step or manually prior to this, where you have denied Google access to your camera.
The prompts on why Google Lens cannot access the camera, is entirely up to Google, Lens is not an Asus app and we cannot change its behavior.
In the end, at least the problem has been remedied. The root cause is not a bug but rather a manual system permission rejection made. Thread closed.