Issues with the oauth2 flow to integrate Swan

1. The link in the email with the OTP is sometimes missing the `redirectTo` parameter. Without it, the link just leads the user to login and the flow breaks.
2. With the `redirectTo` parameter, the flow breaks at the `oauth/consent` endpoint.

You cannot approve the scope and you are not redirected back to the redirect URI specified in the original OAuth2 URL (back to Specter). However, the user still gets logged in. If he tries again to link the account in Specter the flow works.