Hi @jeremy_Meignan Welcome!
The verification endpoint was retired along with the text courses on 30 June 2026, so course-level-2/verify returns “not registered” on every host it ever ran on, including the older internal.users.n8n.cloud one. There is no replacement URL for the old badge.
Your public profile is hidden, so nobody can check the badge at all right now. Turn off “Hide my public profile” under Preferences > Profile, then use your badges page as the credential URL on LinkedIn: