Update: My banking apps, are in my secure folder. I've just discovered you have to also register your fingerprints in the secure folder as well if you want to use fingerprints within the folder. I thought because I was the only one using the phone then one set used to open the phone would do both... All sorted now thanks 👍
PS I think it could be make clearer in the description, rather than it being optional to put your fingerprints in the secure folder as well, it's really necessary in order to get secure apps to work with fingerprints within the folder