Yubikey 5C with Safari

I tried to setup new Yubikeys (5C) to use with cloudfare.

Safari didnt seem to want to do much of anything, so I tried FireFox and was able to quickly and securely register 4 keys with Cloudfare.

They worked and logins are perfect and fast.

However I still can’t get Safari to respond much when I try to login, I insert the key and press the button and then get a pop up from Safari:

This webpage is trying to ask you to sign in using a passkey or security key. Do you want to allow this?
Don’t Allow / Allow

I press Allow and yet nothing happens. I have tried all of the keys to no avail.
Not sure what I am missing here as I have the keys setup and everything works within Firefox but not Safari.

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