Adam, the problem I'm running into is due to the IP proxy I normally use having been changed from ARIN to RIPE due to an ownership change at the hosting datacenter, which is still in NYC. Thus, nevertheless, I show up as coming from the UK, it looks like, when I access Cloudflare-protected sites in the US, and I'm running into more and more of them. The local newspaper, grocery store, credit card co's, etc., It seems that Cloudflare IPv6 geolocation is broken, and interferes even if you're coming from an IPv4. This is just asking for trouble if you ask me.
Troubleshooting done. If it's any consolation, I don't think Cloudflare is the only offender. Geolocation is a crappy idea to begin with, if you ask me.
When I started having this problem logging into a certain credit card co.'s website beginning with about Firefox 105.0.2 on Fedora 38, I was told by their apparently outsourced customer service that I had to use Chrome, which I don't have installed there and couldn't try. Yeah, they wanted me to use LogMeIn so they could fix the problem, too. Right.
Firefox on Android was still working, though, loathe as I am to put passwords of any significance on my phone. Doesn't directly address your question, which I'd like to know the answer to as well.
somewhat ironic, but I'd say effective.