Sorry to dig up an old thread, but I'm having the same issues and have exhausted everything I can think of to resolve this (3 escalations and an ongoing conversation with the Twitter support team that has lasted almost 2 weeks).

I have been combing my wife's Freedom URs with my CSP's URs for the past 2 years or so with no issues. In May, I was approved for an Ink Plus. Around that time (possibly even the same day I was approved), I started getting the "unexpected error" message when trying to combine points from my wife's Freedom with my CSP. I wasn't too concerned because I was working on the Ink spend. The odd thing was that the Ink replaced the CSP on the combine points screen on my wife's Freedom account. I never added it in; the system must have picked up my wife's name as a business owner on the Ink. I deleted it and tried to add my CSP back in, which is when I started receiving the "unexpected error" notification. I assumed it was a website glitch and forgot about it.

That brings me to the past 4 weeks. Chase CSRs have escalated my issue to "marketing" 3 times now. They keep sending me a letter with instructions on how to combine my points, which obviously isn't helping. One supervisor finally brought up the linking issue. However, I couldn't unlink my CSP and Ink since they were under the same login. I thought that moving it back to separate logins for business and personal would help, so I did. I was then able to unlink my Ink and CSP, but that hasn't solved the problem. All of our cards have now been unlinked for weeks and it still gives an "unexpected error" message when I try to combine the Freedom and CSP UR points.

The other interesting part is that I can't move points from my Ink to my CSP now that they're under separate logins, but it will let me move points between the Freedom and Ink. It would let me move from Ink to CSP when the accounts were merged under one login though. Also, I can moved points from my CSP to my wife's Freedom! Now that nothing is merged and everything has been unlinked, no points can be sent to my CSP. This wouldn't be a huge deal, except I actually use my CSP and would like to pool the points. I guess I could move from CSP to Freedom, and then to Ink, but I'll likely downgrade to Ink Cash at some point, so that isn't a long-term solution (that and I'd just like it to work the way it's supposed to).

The Twitter team claimed that their marketing team solved the problem and transferred the points manually. All they did was debit points from Freedom and credit points to the CSP, but it wasn't technically a transfer, it just shows as a manual debit and credit.

So, I'm pretty much at a loss and just wanted to see if anyone else is still in the same boat. Is there a keyword or piece of information I'm missing that could help me here? I've even tried using the middle initial and making sure all of information in all accounts is identical. Again, this used to work before I received the Ink, so I don't know what changed. Any help would be much appreciated! Sorry for the long post!