So the same thing happened yesterday around this time and caused me to end the session early.
Yesterday I got LE 65 upon re-entering into the new hub (Silks Haven?) but could access my other online chars. Restarting the game or steam didn’t do anything.
Same thing today after I logged out in Temporal Sanctum. Can’t get back in. Other chars work.
The link to the thread detailing which information I shall provide, is dead 
Playing Legacy on EU West.