Move Brevo moves an environment's email set-up to a different Brevo account. It recreates the sending domain, committee senders, lists, member contacts and list memberships on the new account, points Mail Settings and notifications at the new list ids, and registers the events webhook there.
Admin → Platform → Environment management → Move Brevo. Role addresses and list settings are still edited in Committee Settings and Mail Settings.
If the sending domain's DNS is not managed through Cloudflare, the run stops and shows the records to add rather than failing part-way. If a member write fails at the end, the exact members already updated are listed, and Mail Settings keep pointing at the old account until a full run completes. On a second run, existing contacts, folders, lists and the webhook are matched by name or address and reused rather than duplicated.