Confused about 'WifiExtra' Hotspot connection not working on my new Pixel 9 Pro.

[wakawaka123]

Been with o2 for years with the same number. 
New Pixel 9 Pro that I've set up and used for a few weeks. 

But when trying to connect to the 'WifiExtra' hotspots on the underground (or anywhere for that matter), it does not auto-connect.
It doesnt allow me to 'setup' as a new device via the o2 site (which I think instructions say. I remember this happening on my prior phone years ago when I first set it up).

When I do click the wif name,

it comes up with this:

 

Why do I need to fill this info in? How would/should I know what to put? 

Now, with a bit of googling, I found I have to set the EAP to AKA, and lo-and-behold, it connected.

 

 Am I doing this right? Missing something obvious?