How do I get a Passkey for the Lightroom EMail Function

I have recently had to change my Google Password and the passkey I had for the email function now (of course) no longer works. I have tried all sorts of help listings but none of them seem to be upto date with the latest google information. It keeps showing ensure 2 step, then “signing in to google” “select app passwords” neither of which seem to exist in my versions. Any help please.