Have you tried this yet?
If your bank recently changed their website or password requirements please read and follow instructions here: Quicken Uses Incorrect URL for Online Banking
For online billers please see if you can manage (remove and re-add) the online biller, to see if their profile has already been updated.
If that doesn't resolve the issue:
Please let us know if you were able to get this issue resolved (or not).
I am having the same issue as discussed above. The last Amazon Syncrony transaction that downloaded to Quicken for me was on 3/25/24. Since then I have been unable to get any new transactions to download. I have reset connection, I have disabled and added back, I have even had it download transactions to a new account in quicken and still no transaction after 3/25/24.