Good morning ....
I no longer have access to the email registered in the Jira because it has been deactivated.
I tried to update my email but to validate this update I have to log in with my account password (I don't remember).
Is there any other way to regain this access so that this email change/update will take effect?
Welcome to the Atlassian Community!
Without access to the old email address, you are pretty much stuck here. Have a read through https://support.atlassian.com/atlassian-account/docs/troubleshoot-login-issues-with-your-atlassian-account/ to see what else you can do other than trying to reset the password via email.
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