Unable to connect to Citicards since Sept 2nd. (QB Desktop Pro Plus 2024)

Ever since Sept 3, 2024 I have been unable to connect to Citi cards for any account. My last successfully connection was on Sept 2. Prior to Sept 2, I have downloaded transaction with no problem for.... a long long time almost every business day.  It is a core part of my workflow. All of my other bank feeds (e.g. Wells Fargo, AEX, Morgan Stanley, Chase) are all working correctly with no issues.

I spoke with QB support and they continue to treat me like a newbie idiot. I have used QB to download transaction for many years and understand what I am doing.

Anyone have any thoughts?