We need to have this notification removed asap!

[Merlin]

This question is in reference to Atlassian Documentation: JIRA Service Desk: Disable Account Creation Notification

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[Nic Brough -Adaptavist-]

You can't currently disable it on Cloud.

You might want to raise this with https://support.atlassian.com - they might help, but if not, the more requests they get, the better the feedback that this is needed going back to the developers.