Hey @Lukas Bzyku ,
From your question the wording might be a bit confusing. I think you mean 2 jira cloud instances on the same email address ? (and not 2 Atlassian accounts with the same email address).
Having 2 accounts with the same emailaddress (2 atlassian id's) is as @Jack says impossible as your email is your user id.
Having 2 or more Jira instances linked to the same Atlassian id that's not problem. Just sign up for another instance with the same email.
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