Slash command not showing

Checklist for slash commands that never appear in the picker.

Invite included applications.commands
Old invites without that scope never registered commands for that user.
Global commands waited long enough
Global registration can take up to an hour to show up.
Guild commands targeted this server
A guild command registered for a different id will not appear here.
Name is unique and lowercase
Discord rejects duplicates and uppercase command names.
The bot is in the server
You cannot see its commands from a server it never joined.
The client was restarted
The desktop and mobile clients cache the command list.

Still missing

If every box is ticked and the command is still absent, compare the registration response body for a 50035 invalid form body.