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Find-MgGraphPermission

The Microsoft Graph PowerShell SDK application requires users to have domain knowledge of both the semantics and syntax of Microsoft Graph API permissions used to authorize access to the API. Microsoft Graph PowerShell reference

From the Microsoft Graph PowerShell reference 5 parameters Its page in the reference

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Parameters

5 in the Microsoft Graph PowerShell reference
-AllTo return all possible permissions rather than just those that match the SearchString parameter, specify the All parameter.
-ExactMatchSpecify the ExactMatch parameter to restrict the permissions emitted to those that exactly match the value specified for SearchString.
-OnlineSpecify the Online parameter in addition to SearchString to force Find-MgGraphPermission to update its set of permissions by requesting the latest permissions data from Microsoft Graph itself before…
-PermissionTypeSpecify the PermissionType to determine whether application permissions, delegated permisisons, or both are returned by Find-MgGraphPermission.
-SearchStringThe SearchString parameter allows you to specify a string such as 'user' or 'mail' that represents the subject or domain of the permission you're searching for.