There's an up to date list here - my specific problem were Lloyds group ones as mentioned on that page.
The parking app is paybyphone which I've only used a handful of times. Ringo which I normally have to use seems to work fine.
I've been transitioning over the last week or so, on a new 8 pro,which is the same dimensions as the 4.5 year old Samsung it replaced.
So far, I have two banking apps from the same UK provider that don't work due to them checking the same flags as Google Pay (12 other banking apps I have work fine), one parking payment app that doesn't work and I've been told uber has started to be glitchy with their latest update.
The work around for all of those (apart from Google Pay) is use them via the web browser where they are fine.
Do you use docker for anything else self hosted? You should give it a try. I literally had not heard of grocy till I read your post but I self host other things with docker. I googled them, visited their github looked at their docker instructions - theirs downloading a docker compose file and lsio's which gave a run option rather than compose.
I pulled up an ssh to my server from my phone and literally entered the run command from here just modified to have my preferred storage path.
docker run -d \
--name=grocy \
-e PUID=1000 \
-e PGID=1000 \
-e TZ=Etc/UTC \
-p 9283:80 \
-v ~/.config/grocy:/config \
--restart unless-stopped \
lscr.io/linuxserver/grocy:latest```
I then opened my browser to http://ip:9283 and was prompted with a username and password. I googled and found out the default is admin/admin. I now have grocy temporarily running on my server. If I want to run it permanently I'd include it in my existing docker-compose stack or create a new one with just it in it.
I understand it's frustrating and you may not want to use grocy after all and someone might have a good alternative, but getting to terms with docker will make your self hosting life much easier - it took me longer to type this post than it took me to get grocy up and running with docker.You should have a look for capture the flags for penetration testing.
TryHackMe currently has a free Christmas program which has a beginner focus and outside of that they have a mix of free and paid for content (don't be tricked into feeling you need to pay if you just want the free content, navigate about a bit)
I've done some of the content and CTFs at HackerOne and I have heard of people liking HackTheBox too although I haven't done anything over there myself.
Hopefully that gives you some inspiration and guidance to get started!