Hey Clay Team - I'm getting about 8% of my leads listed as "Could not add lead" when using the smartlead integration. Screenshots incoming; can't tell what the issue is. Retrying yields same result.
There's a chance that you probably added these leads to a separate campaign before and to add them to a new one in Smartlead, you'd need to enable this option here:
Arturo O. was spot on - it was the duplicate lead setting. Glad you guys are going to update the error message to make it more explicit! Thanks again for the top notch customer service.