I'd recommend removing Pie as a supported platform. Pie even on Samsungs employ the new overlay signature checks, and such custom fonts cannot be installed on anything but the early beta builds.
I updated my Note 9 to official Pie through OTA and it was working without any issue.
Then freshly did a factory reset and is actually working flawlessly out of the box too.
I'm using it right now with the Gafata font and I even didn't have to reboot the phone for it to work.
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