Hi @吉田将人 and welcome to the community!
The email address of the community account you used to make this post is an alias to a Bitbucket Cloud account.
You can view the aliases of the Bitbucket account on this page https://bitbucket.org/account/settings/email/ if you log in with the account's primary email address (it is not possible to log in with the alias).
Additionally, there is an Atlassian account with this email address.
What is your goal? Do you want to make this email alias the primary email of the existing Bitbucket Cloud account that it is linked to?
Kind regards,
Theodora
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