Several of the local (Minneapolis) ABC channels do not show up on the program schedule. The main channel (5) is there but not all of their affiliates.
I’m in the Minneapolis area and my programiing for the ABC channel affiliates (5.x) all show up. What zip code are you using? Perhaps try a nearby zip code or a zip code closer to the center of the Minneapolis area.
When was your guide data last updated? You can look under Guide Status on the settings page.
Call Tablo, open ticket, wait six months. Repeat if needed.