i'm having this same issue. All my hidden accounts have been deactivated. Very frustrating—won't update.
https://community.quicken.com/discussion/7961553/td-bank-ol-393-a-error-code-plus-ol-304-a-for-closed-acct-at-td-and-on-quicken?utm_source=community-search&utm_medium=organic-search&utm_term=ol+393-a