A while back it was a problem that occurred when you linked your twitch acc with bungie, so hopefully its a similar bug with linking it with epic. If that's the case try unlinking your accounts in your bungie settings. If that doesn't work or you can't best bet is to wait for someone else to help you out.
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I tried to unlink, but the only way to unlink Epic is disabling CrossSave which is very important to me when I play D2, so that means I'll have to wait for bungie to solve this.
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I have this same problem! Ever since I linked my epic account I can’t log onto destiny 1 without getting error code Tapir