My phone use to connect to the DVR, the green light shows the wifi is on, I can connect to the wifi on the DVR with my phone but when I try to open the app it says wifi not connected.
1. Refer below picture to forget WiFi.
2. Turn phone to airplane mode and enable WiFi for connection.
Keep me updated and see if that works.
I should also note the green light turns solid for wifi connected on the DVR but when I try to open the app it says wifi not connected.