Troubleshooting Smartlead Integration Issues in Clay

Having some trouble with the Smartlead integration. Have an active campaign in SL that we're trying to add more Leads to and just get spinning cells in Clay. No error message is displayed, only goes back to "Click to run" upon refresh. This campaign was paused in SL but resumed. Have tried reconnecting the API key, refreshing fields in SL integration, and creating a fresh SL column in Clay without success. Any suggestions?