Keychat group chats are private and can only be joined through friend invitations. You can’t invite others to join the group by sharing a Group ID.
If you want to create a public group chat, you can use Chachi in the Keychat browser. Chachi is a web client for public Nostr group chats.
Here’s a public group we’ve created:
If you see this note in Jumble on Keychat browser, just click the link to join the group. 👇