QR Scanner / QR Reader?

I try to use the QR Scanner in my app. However, it doesn’t seem to open the QR view (. Has anyone gotten it working recently? It definitely worked in the past for many, as I saw in the discussions.

Update: Something in my particular app prevented the camera from opening up. Don’t know why/what yet.
For testing I created a fresh new app, and there the QR/Camera could open.

Anyone having an app with about a year old that can open QR / Camera properly?

My app id is 449853 just in case any admin is around and can help! Thank you in advance!

@Mevi What can I check to resolve this QR issue? Thanks.