I ended up on this page because I experienced this error in the home assistant ios app and was looking for a manual fix. After much googling, I finally figured it out. Just for the benefit of anyone else who might be in the same situation: run the keychain app on a macos device view menu -> Show Invisible Items find the frozen thread credentials and delete them You should now (hopefully!) be able to re-add your thread credential from the HA companion app It worked for me. Hopefully for you too!