Trying to install Lucky Patcher 7.2.9 on OnePlus 6 with OxygenOS 5.1.7 and I just got an error "App not installed"
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Please see my response from the following post here since they apply to your device as well...
https://www.luckypatchers.com/forum/reportbug/zenfone-3-unable-to-install-luckypatchers
Good Luck!
~Ibuprophen
Dude, I found a way:
I installed the previous version 7.2.8 https://apk.luckypatchers.com/Files/LuckyPatchers.com_Official_V7.2.8.zip instead of the current 7.2.9.
And it worked for me. Give it a try, good luck!