Have you tried the "Review and Repair Online Billers" function? (Bills, Income & Transfers tab, gear icon, Review and Repair …)
If all else fails …
If your bank (the one that runs your checking account) recently required you to reauthorize your checking account and/or your bank has changed from "Direct Connect" to either "Express Web Connect" or "Express Web Connect+" you can no longer use Online Bill Pay direct to the bank or Quicken Bill Manager's Quick Pay function. The bank no longer supports this function through Quicken.
You have these alternatives (in no particular order of preference):
I've been using a variation of method #3 for decades, since before the Internet and dial-up were even introduced. It's easy to get used to this process. And I have yet to miss a single payment.
Please stop suggesting that we just go along with the billers. This requires us to trust every biller and if you are in the software business you will know that the more trust you advance the more vulnerable you are to software errors. It's great that it is working for you, but it is not a generic solution. I concur with the OP. This needs to be fixed or VZW should be listed as unsupported.