Bought the mount pack and opened it, claimed the bear and equipped it, not showing up for any other characters. I have video if you need it, but I'm on Xbox so I might need to upload it. Did not previously have that mount as account unlock, and did not have it on the character that opened it.
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Last sentence: "Does not unlock reclaims"
"an account-bound version of one of the following items:"
Fwiw I got stuck with this same issue with the leg Toad vanity pet from one of the campaign premium tracks, it said it was bound to account but I took that to mean it was account wide. I was very upset when I found out it was only for single use.
Check to see if it says 'account bound' on it's tooltip status, if it is, put it in the shared bank and move it to another character.