I am experiencing the same problem. I can confirm that I was added as a user of the project and I was assigned to multiple assignments. The worker map is working fine when viewed online. However, in my mobile app, it says "No Maps. Maps will appear here once you've been added to them".
I am using app version 21.0.1 build 275. I am not sure the version of ArcGIS Online that I am using. My organization account is pennstate.maps.arcgis.com.
btw in the dispatcher map I am shown as active. I could see the project earlier in my phone app but it was suddenly gone.