The easiest solution would be to run the scan as a System Administrator. However, if you want to be more specific with the permission assignments, the following permissions would be needed:

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Modify Metadata - Required

This is necessary for Hubbl Diagnostics to retrieve and analyze metadata from the org.

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View All Data, or appropriate Object CRUD + Field Level Security (FLS) - Required

Hubbl Diagnostics can only provide object and field analysis on fields that the user running the scan has read access to. Any objects or fields where permissions are not available will be omitted from the scan output.

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Install Packages and Manage Package Licenses - Optional

In order to provide package analysis, Hubbl Diagnostics requires both of these permissions. Salesforce does not have a discrete read-only permission to view installed packages.

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ViewHealthCheck - Optional

For some recommendations, Hubbl Diagnostics relies on Health Check information. Without this permission, these recommendations will not be available.