After searching though the internet I realized that since it is bought in China it does not allow to use Google Play Store. I doubt that it is not certified or not supported since it is bought in a Samsung store and it is an original Samsung tablet. I tried rooting (using odin and CF_AutoRoot_Port_T800_BeansTown106.tar) but no solution yet.
How to Install Android 9.0 Pie Gapps Package. First of all, First of all, Download and move the Android Pie Gapps to internal storage [root folder] Now boot your device into TWRP Recovery. Tap on the Install Button. Look for the Gapps zip file in the internal storage. Tap on the Pie Gapps zip file. Now swipe to confirm the flash and that’s it!
As we all know, Xiaomi phones on China MIUI ROM doesn’t comes installed with Google Play Store. Xiaomi Redmi Note 4 and Redmi 4X are among the users who have been missing Google Services on their devices. So, in this guide we’ll show you how you can install Google Play Store and other Google services on your Redmi Note 4 and Redmi 4X
How do I download Google Play store on my Xiaomi China ROM? How to Install Google Play on a Chinese Xiaomi Phone. Return the phone to sender and purchase a Global model. Unlock the bootloader and install a Global ROM. Install Google services and customise the Chinese ROM to suit your needs. How do I download Google Play on Xiaomi MIUI 10?

Download Redmi 5 Play because the Google Play Store size is around 40MB so the Google Drive detected it as a scam lol you may use Google Play Store in China

Let’s learn now how to install Google Play Store on Chinese Android phones. Learn to Install Google Play Store on Chinese Android Devices via Google Installer: Download the most recent Google Installer APK file; You must place it to your phone’s internal or external storage;
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download google play store rom china