This is how I managed to connect a Huawei P10 lite (Android 8) and a Huawei Mate 20 lite (Android 9) to my 2014 Mitsubishi Outlander PHEV in 3 not-easy steps:
1. went to an authorized dealer to update the car software to get rid of "Error 2104: no security update"
2.1. reset the car's wifi (see below)
2.2. uninstalled and re-installed
this app on my phone
3. disabled mobile data (3G/4G) on my phone, disabled WiFi calling, NFC, bluetooth. Left only WiFi and Location Services on. Opened the app the followed the instructions
WiFi Reset Procedure ( copied from https://www.myoutlanderphev.com/forum/viewtopic.php?p=38426#p38426 )
1. Get in the car and Fully close the Drivers door.
2. IMPORTANT - All steps below must be performed within a total of 30 seconds.
3. Without pressing the brake pedal, press the power button once so that it glows orange (ACC mode).
4. Turn on the Hazard lights.
5. Now quickly alternately press and release the LOCK and UNLOCK buttons on the key fob 5 times, i.e. 10 presses in total. This must be done within 10 seconds of pressing the Power button ON as in (1) above.
6. Listen for one BEEP, followed by 0, 1 or 2 more beeps.
7. Now quickly alternately press the LOCK and UNLOCK buttons on the key fob another 10 times each within 10 seconds, i.e. another 20 presses.
8. Listen for one BEEP, followed by 0 more beeps.