Hello William,
Thank you for raising your query in the Microsoft Q&A Community.
I understand that you are not able to access your subscription after removing the duplicate users with Owner roles.
If there are no other users with an Owner or Privileged Admin role that can reassign an Owner role to you on the Subscription, you can elevate your access if you currently have a Global Admin role in the Entra ID. Also, anyone with the Global Admin role can elevate their access and this will the user the permission to assign a role on the Subscription.
Kindly follow the link below to get more information about how to elevate your access.
Let me know if this works.
Babafemi