Unfortunately, your browser is unsupported...Safari Version 14.1.2

I’m getting this message when I login with safari Version 14.1.2. Any ideas?

and more specifically:

Which suggests you might get away with >=15.7 on macOS

Much appreciated for the response. I just updated my machine last week and figured I had the latest version of safari. Apparently not.

For Safari you will need to be running macOS Monterey or newer for Safari 15. Alternatively, you can also use Chrome, Edge or Firefox.

Got it working in safari. Much appreciated.