I ended up calling customer service. On the easy forms for the T3, there are two boxes for 21, 52, and 53. When I adjusted to total capital gains vs foreign the error cleared. Not sure why there would be two boxes. But making that change cleared the error. I will also say I've seen negative reviews about customer support, but that was not my experience. I called and there was a 30 minute wait but was allowed to leave my number for a call back and the rep was nice and helped me out pretty quickly.
