Sometimes, some people, it's a challenge to get an app to work. Other people not worth it. One option is to use native apps on HU. Buy a USB 4G modem and get a data plan. or Use your phone to create a hotspot.
Some ideas if you're a looking to make it work. You're never able to get the screen on, even once. I don't think it's an issue with HU Reloaded.
Disconnect any other devices using USB. Use the cable which came with your Sony phone.
Try both USB ports. Uninstall or disable any similar apps including auto connect, mirror etc.
go to the forums and find the thread for your unit. See if there is a firmware upgrade available. See if there are people with similar issues. A quick google search shows at least one poster found their eincar HU locked out some third party apps. Uninstall, or disable, any similar programs including easy connection, autokit etc. Long shot, does your HU offer android auto or carplay natively?
Could some kind of virus/malware protection software , or firmware feature, being locking HUR out?
Obvious, uninstall HUR, re-install making sure to grant all permissions. Same with android auto app on your phone. Can you borrow a different phone, relative, friend or neighbor.
A few vendors released HU which were marketed as running Android 10 but were really running Android 9. It was hacked so information screen suggested it was running 10. I have no idea what issues that could cause. Probably not.
I tried my old phone and it works. I then factory reset my current phone and it works as well! I guess I installed some apps that were interfering USB connection with HUR. Thanks you so much for the suggestions