Check if your Salesforce has API Access.
You have successfully connected to Salesforce but the data is not synchronizing into it. This happens mostly maybe your Salesforce organization doesn't have API Access.
Our app strongly required API Access for your organization to transfer the data. Some edition of Salesforce doesn't have API Access. See below image
- First, check on the organization settings. Enterprise, Unlimited, and Developer editions have the API enabled by default. Professional Customers can purchase this feature.
- Professional and Essential editions don't have the API Access hence data synchronization will not work.
If you found your edition has API Access then there may be another issue. You need to check whether API is enabled for the user.