Your best bet is to provide proof of ownership of your Meraki Dashboard, and hope that Meraki Support will help. Even then it'll be difficult, as Meraki is not allowed to add admins to customers organizations.
Or, if you know the email that has been created, make an alias of it to another account, and use password recovery to gain access to it.
That being said, it is highly recommended to have additional accounts created on the dashboard, just incase you lose access to your administrator account. Just as what appears to be happening to you right now.
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