Get an error Unknown or invalid login ticket

[v-matthew]

We experienced the same issue here:

Intermittent error: Unknown or invalid login ticket

We switched to auth0-js 9 from auth0-lock (10, then 11) a few weeks ago, and things were working swimmingly until Thursday morning, when some of our team members were suddenly unable to login or signup. We have the cross origin verification page setup, it works well, and we are even logging customers out before logging in or signing up, but still the intermittent error persists as follows: "error": { "message": "Unknown or invalid login ticket.", "oauthError": "access_denied", "type": "o…