AEP to Shopify OOTB batch connection fails at “Add data” step with source connector read error

I am setting up an Adobe Experience Platform (AEP) to Shopify OOTB batch connection. The source dataflow connection was configured successfully, but the connection fails during the “Add data” step in the connection setup.

Error Message:
The following error is displayed:

The request could not be processed. Error from flow provider: The request could not be processed. Failed to read from the source connector. Error code: 'InternalError', message: 'Error while reading single record for table: ...'

Expected Behavior:
The Shopify source connection should successfully read the source data and allow the batch connection to proceed through the Add data step.

Actual Behavior:
The connection configuration fails when attempting to read data from the Shopify source connector.

Impact:
This is blocking the setup of the AEP to Shopify batch connection and preventing data ingestion.

Troubleshooting Performed:

• Source dataflow connection was created successfully.
• Issue occurs specifically at the Add data step.
• Error appears to be related to reading a single record from the source table.

Please suggest if I am missing anything here.