This subject comes up every so often, so I took the liberty of creating a new thread. I have 5 personal Citi credit cards, 1 Hilton Visa Signature, 2 Business MasterCards and 1 Business Visa.
I have never been able to activate download for more than 2 credit cards on any given User ID. So, what I do is to enroll all my cards under separate IDs, but only activate 2 for download on any given ID.
IOW, I download from 3 personal IDs, 2 cards for the first 2 IDs and 1 for the third one. The Hilton Visa Signature is a separate download even though it's issued and managed by Citi.
I download from 2 business IDs, once again, 2 cards for the first ID, and 1 for the second one. Other people have reported being able to download more than 2 cards, but I've had some of my Citi cards since 1984, and I have never been able to accomplish that feat.
HTH, Bob