You can get the real lightning address and custom key/value by going to the .well-known of the user you're interested in: https://getalby.com/.well-known/keysend/ericpp
For Alby Hub, the lightning address is the pubkey of your node, custom key is the standard 696969, and custom value is the ID of the connection/wallet in the hub.
See: https://guides.getalby.com/user-guide/v/alby-account-and-browser-extension/alby-hub/faq-alby-hub/how-can-i-share-my-alby-hub-with-a-friend-who-is-a-podcaster-or-musician