This feature is riddled with connection issues and has been for a long time and it get's zero attention. Almost all my online billers has a "fix it" icon, but clicking that does absolutely nothing. it either comes back and says "account is locked" - account is not locked, or it says "still connecting - try back in a few days" - been getting this message for months, or "invalid credentials" - they are not invalid.
Very frustrating to have a feature that used to work stop working. No matter how many times I report it or get emails from product managers it NEVER gets fixed.