Root user cannot 'remount'

Hi,
after a lots of hassle I finally accessed the root access into my Sony z2 tablet. But the Root Checker Basic app says

Quote:

Sorry! Root access is not properly installed on this device.

I can still run

Code:
adb root

without error. And the

Code:
adb shell whoami

returns "root".
Still when I run

Code:
adb remount

it says

Quote:

remount of /system failed; couldn't make block device /dev/block/platform/msm_sdcc.1/by-name/system writable: Permission denied
remount failed

I need to remount the device because I want to move an APK to the "/system/priv-apps" folder.

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