Troubleshooting Clay: Issues with Phone Number Enrichment in Free Trial

Hi, I'm new to Clay and I have a free trial going on right now. I searched for certain companies in my city and wants to enrich the table with their phone numbers taken from their domains (which are already added in the table). I have tried Clay's own AI method and a "Find Phone Number" method, but none of them are giving me results. It keeps showing, "Column could not be created" or "Cell hasn't run" even though I keep on running the cells. What am I doing wrong?