Please check the Error Messages tab, which contains the reason why the contact failed to get created. There is a possibility that some trigger or process failed in your org. You will find the issue on the Error Messages tab. Please follow the below steps to identify the issue.
Step 1: Click the App Launcher icon (the grid icon), search for "Error Messages," and select the Error Messages object.
Step 2: Ensure your List View is set to "All" to see every record. Click on the specific Error Message Name related to your customer sync (contact).

Step 3: Review the Message field. This field will display the exact Salesforce error preventing the Contact from being created.

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