I didn't create this account and I don't know how to delete it.
Hello @Diego Oliveira
Welcome to the Atlassian community.
Are you trying to delete your user/login account?
If so try following the guidance here:
https://support.atlassian.com/atlassian-account/docs/delete-your-atlassian-account/
If that doesn't work for you please tell us exactly what blicker you are encountering.
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