This private campaign is for the existing group. Create a code in YOUR OWN browser only. Never post a code someone else sent you. Posting the code asks to give this browser read-only campaign access.
Post your code in the original RPG group yourself. Once approved, return here and choose Check approval. Codes expire after 15 minutes. Viewer access lasts at most 24 hours after your fresh group approval. After it expires, create and post a new code from this browser. A seven-day browser cookie does not renew group access.