Start with the platform change
TVNZ says its April 2026 migration signed everyone out, including people already logged in. Its migration help says accounts, watch history, saved content and profiles moved across automatically. Being asked to sign in again therefore was not itself evidence that a household needed a new registration. If migrated information initially appears absent, the help recommends waiting a few minutes and refreshing while it synchronises.
Use the account’s email rather than an old password
Open TVNZ+ or its website, choose Log in and enter the linked email address. Retrieve the six-digit message from TVNZ+ and enter it on the sign-in screen. This is the documented current login method. A password manager supplying an earlier TVNZ password does not complete the email-code step or identify which address holds the existing viewing record.
Request a fresh code when necessary
TVNZ’s OTP instructions give the code a ten-minute lifetime and allow another request after sixty seconds if it has not arrived. Check Spam or Junk as well as the inbox. If a code expires, request a replacement rather than continuing to reuse it. Keep the code within the official sign-in flow; it authorises account access and should not be copied into a public support post.
Update before repeating the sign-in
The migration page says the old application will not work with the new platform. Update the TVNZ+ app on the intended device before interpreting repeated login trouble as a lost account. The documented data migration applies to the existing account identity; creating a different account because the old email is inaccessible is a separate decision with different saved-data consequences.