you for reaching out to the Community regarding your issue, although I am sorry
to hear that you are experiencing issues downloading transactions. I'm wondering here since you're experiencing issues on all your accounts if Quicken thinks you're signed in properly. We can test if that might be the case by signing out and into the program. To do this across the top select Quicken > Sign out. From there you should be prompted to sign in again.
you get a chance to try these steps see if you get any differences while trying to update the accounts. If not let us know and we'll see what our next option is.