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I had the same issue.
I found out after calling Chase that only 1 frequent flyer account can be linked to 1 Chase account.
So for example, 1 United account can’t be connected to 2 Chase Ultimate Reward accounts (if you have 2 INK cards for example).
You have to call Chase and transfer the UR points to the account that is linked to the frequent flyer account.
It is a bit annoying but oh well.
Hope that helps!