Why Cant I install some apps from Google Play or install from apk

Its the wierdest thing ever. I got rooted a couple days ago and got magisk and xposed running on my LG Aristo 2. But some apps I try to in stall on google play come up with the error code -504 but some apps do install. Then if i try to install an apk alot of themcome up with the error app seems to be corrupt then again some do install. Any help?

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