I use Opera for Android on a Pixel Tablet and Phone version 96.3.5010.87899.
A website I use ritchies.com.au, if I have Opera set to mobile mode and try to look at their catalogues a forbidden message pops up but it is fine in Desktop mode.
If I use Chrome on the same devices to access the catalogues no issues in Desktop or Mobile Mode.
I was wondering why the site works fine in Chrome but not Opera in Mobile Mode, Thank you.