What does this message mean when account merging?

I wanted to merge my 2 Fortnite accounts, but the following message came up:

UPS
Unfortunately, the merge does not seem to be possible with your account because it was created or linked to a non-approved date.
What does this message mean? How do I solve this?

Maybe one of the accounts is too old or young… There you have to deal with the support of Fortnite… They can certainly help you there:-)

all you need to do is contact epic games saying swing swong and then boom