I just converted from Windows to Mac. I finally leant how to setup my month credit card bills t show up in "projected balances". but I messed up some of my credit card eBills so I removed them and tried to re-add them. Re-adding worked smoothly, all I had to do was select the issuer (in this case I had 2 Chase visas, 1 Wells Mastercard, and 1 Amex). The visas and Mastercards added with just a couple clicks and it showed up in Bills & Income and Projected Balances automatically.
But for the AMEX, I keep getting this pop-up. and I know my log-in is correct because I tried both reconnecting my AMEX account in the register, AND use the "add new login" option in the screenshot and the log-in worked fine. But when I click "Continue", I get this pop-up.