Can you attach a screenshot of what happens when you try and login? Can you try to login from incognito mode?
Cloudflare can’t do that. You bank could use settings in cloudflare that result in traffic being allowed, challenged, or disallowed. But, how those settings are set is not determined by cloudflare.
I cannot do online banking via the app or website due to cloudflare captcha fail.
It attempts to verify - spins and then i get a message saying error with a text link to refresh. Process starts over. Bank has no idea what i am talking about.