i tried to merge not to overwrite with other account,
An error occured during the import process.
I need to step back for the old data in yesterday but i cannot
I would recommend opening a support ticket with Atlassian so they can give you more information on why the import is failing, however I will say that I tend to get that error only when I'm merging user accounts instead of overwriting them. Is there a reason you want to merge the accounts rather than overwriting them?
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