Salesfore Integrations widgets require that the Salesforce instance you are connecting to has Cross-Origin Resource Sharing (CORS) permitted for your digital workplace.

How to Enable CORS for your workplace in Salesforce Client Server

Step 1: Log in to Salesforce

Go to Salesforce and login using an admin account.

Step 2: Enter the setup panel

Click “Setup” at the top right corner.

Step 3: Navigate to the CORS Management area

In the left nav, go to Administration Setup->Security Controls->CORS.

Step 4: Authorise your workplace

Add your full workplace URL.

Step 5: Save

Click the save button to complete the process.