I understand that, I’ve tried both domain=CompanyWork and domain=CompanyWork.internal in my cred file and directly in fstab both result in the permission error when mounting the TrueNAS share but work just fine when mounting a share provided by Windows Server.
Stopped at my local Best Buy the other day. Needed an SSD that was locked behind glass. After attempting to get help for a half hour I ordered one on eBay from the parking lot and drove home. I’ve honestly tried to support brick and mortar where I can but I give up.