I got the problem fixed, for now anyway. I kept getting the CC-501 error trying to reset the connection for the Paypal credit account. What I finally found that worked to fix is to go into Tools -> Add Account... and select to add Paypal Credit, Mastercard, and Crypto account. It will reconnect, but with the older Express Web Connect rather than the newer Express Web Connect + method. This will like fail in the near future when this is retired in favor of the newer, secure method. So it looks like there's some sort of problem with the new connection method at either Paypal or Synchrony Bank that broke the newer secure connection method emails were sent out about.
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