1. In Salesforce, go to Settings > Setup. Then search for Connected Apps and select Connected Apps OAuth Usage
2. You should see a DataroPartnerConnect app. Click "Block" then click "Unblock".
3. Log into Salesforce as the user you wish to use to handle the Dataro connection.
4. Log into Dataro and go to Connections on the left hand menu. You will see the API Connection to Salesforce is disconnected. Click the Reconnect to Salesforce button and go through the connection flow.