I paid the fee (I was pleasantly surprised by the normal size of the commission) and sent a PM.
In order for the option to join the pool to appear, do I need to create a team first? It seems that I checked the entire interface (from the browser) and did not understand where I should enter the code to join.
It would be nice if more players showed their teams

I noticed the exact same issue on mobile, therefore I believe it is mandatory for everyone to set up their squad, set team name, before entering a pool. If you aren't ready to go through your team right now, simply use the "auto pick" and proceed, then return at your leisure to make your transfers. I don't know what part of the code I'm typing wrong...... Lol