I used to be able to use the Android app to set the DVR (Motorola DCX3600-M) to record Dodger games when away from home (on cellular data). Just recently the app cannot find "Los Angeles Dodgers" when I search in DVR menu. Used to work for months since I got this DVR. That's why I got this particular model DVR (months ago), in order to insure I would have this capability.
Do you still have the Arris (Motorola DCX 3600 DVR) or the new World Box that runs Spectrum Guide? Mobile APP recording is just rolling out for Spectrum Guide on the World Boxes. (These are boxes without a clock.) and some mobile recording features may not be out yet for World Box. Spectrum just started rolling out Remote DVR functionality for World Boxes/Spectrum Guide.
If you still have the DCX-3600M, that's a different story and there are times even on my Cisco 9865, which runs the ODN (Navigator Guide) can't find shows when searched through the Spectrum TV APP/website. Spectrum has been updating nodes/backends for remote services for several months.
For fastest service on this topic, I would suggest going to @Ask Spectrum on Twitter. Follow that page by logging into Twitter and DM them some account information along with a screenshot showing your failed LA Doger Games search results on the APP. Make sure that you mention that you have the DCX-3600 box or if you have the WorldBox, either a Humax or Technicolor (give model number.) I think its 210-H or 210-T. This will open a ticket,