I now opened an issue on auth0-spa, to deal with the error: Can't create auth0 client when refresh token is invalid (e.g. outdated) · Issue #654 · auth0/auth0-spa-js · GitHub. There was other users affected, which also had to use hacky solutions to make it work: Can't createAuth0Client localstorage + rotation refresh tokens and refresh token is invalid · Issue #449 · auth0/auth0-spa-js · GitHub.