Google account issues

Hey all, I'm at my wits end. I Airs connected to a fold 6. Everything runs fine, except that I can't log into my Google account. If I try to login via the YouTube nebula app, after I put my Gmail address in it gives me the standard "this browser is not secure" message. I've seen people suggesting that I switch to desktop mode, but that doesn't work either.

Support are being unhelpful.

Anyone have a fix for this?