Often HTTP authentication is used on staging sites to avoid uninvited visitors.

This will block the Clerk Importer as well and display a 401 Unauthorized error in the sync log.

You can easily verify the importer by inserting the authentication info in the Import URL like below, in Data Sync at my.clerk.io: 

http//USER:PASS@magento.clerk.io/clerk/api/store/1:

 

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