Looks like the Node.js Graph Tutorial application requires needs one or more permissions which only Global Admin can consent for. There are some permissions for which standard users can provide consent but if the application needs high level permission for example Directory.ReadWrite.All with which any changes can be made to the directory, above message is displayed and only Global Administrator can consent those permissions.
So you would need to contact Global Administrator to provide consent. If this is microsoft.com tenant, you can open a request here
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