IMessage & Facetime unable to activate | Opencore | Catalina 10.15.3

No matter what guide I follow, I am unable to activate Facetime & IMessage on my hackintosh build. My specs are:

- Asus Z170 Pro gaming motherboard

- Intel HD 530 Onboard graphics

- Samsung EVO SSD 500 GB

- Corsair vengeance 16 GB

- SMBIOS = IMac late 2015

- Opencore bootloader

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• I am using emulated NVRAM because my motherboard does not have native NVRAM. NVRAM -c returns: "Error clearing firmware variables: (iokit/common) not permitted "
• I am using an invalid serial number, checked on Apple coverage website
• Ethernet = en0 & built-in (hackintool)

Whenever I try activating IMessage / Facetime, I get the customer code error. I also tried using an account made before 2016