Search for the Import Shared Audience External account
Click on it to display its configuration
Update configuration/remove AWS Region/Uncheck “keep files in S3 encrypted”/save the change
Now go back to Application settings under Administration/Click on Workflows/
Search for the Import Shared Audience Technical Workflow
Click on it to open it/then restart it
Check Log and tasks
The result should be OK - Note that one may get a “No file to transfer found” error if there is no file to import from the remote host. However, the original issue “could not resolve hostname” is fixed.