Hello Choi, Liam (he/him/his),
Thanks for the additonal details.
The new salesforce connector leverages bulk API for better user experience. But recently we did find there are some bugs when using SalesforceV2 connector comapring with legacy Salesforce connector.
Workarounds:
Please use Power Shell command to generate legacy Salesforce linked service and pipelines.
The salesforce related definiation can be found here. https://github.com/Azure/azure-rest-api-specs/blob/7e9e559d09a11686c132aaf4e1759b29f79517d7/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json#L2885C6-L2885C29
(or)
You can use UX feature flag '&feature.enableSalesforceV2=false' to temporarily switch back to legacy salesforce connector to unblock you here. In order to use the feature flag, just add above in data factory URL.
If the new created linked service is with type 'Salesforce' rather than 'SalesforceV2', then it works.
Please try this and let me know if you still having the issue.