Found the solution:
To recover Space Admin permissions:
Go to > General Configuration > Space Permissions.
Locate the space in the Individual Spaces list and choose Recover Permissions.
You can then choose Manage Permissions, and add any other appropriate permissions to the space. Requests to recover permissions are recorded in the Confluence audit log.
Users with System Administrator permissions are able to manage permissions for all spaces, they do not need to first recover permissions.
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