Here’s Some Other Helpful Steps

Solution 1: Add the custom connector to a solution

• This is the most frequent cause of the “Solution Export Error”.
• Create a new solution specifically for your custom connector.
• Add the custom connector to this solution
• Export this connector solution first. 
• Import the connector solution into the target environment. 
• Then import the main solution containing your Copilot

Solution 2: Verify credentials and configuration

• Ensure you have the correct API key or used a Valid Microsoft Entra authentication method.
• Check that the correct regional API endpoint is being used.
• If you are using a deployment, ensure there are no blank spaces at the beginning or end of the deployment name. 

Solution 3: Check for other potential issues

• Firewall/Antivirus: Make sure your firewall or antivirus settings are not blocking the connection.
• Internet Connection: A stable and reliable internet connection is necessary for many Copilot functions.
• Sample JSON: When building a custom connector, you may need to define default responses by importing sample JSON data for your actions to ensure the Copilot can understand the data structure, according https://youtu.be/P8mKbncVNmo. 

Hope This Helps Mike Allen​ !