Runpod not able to be detected at Realme Phone

Hi, guys.
I’m using Runpod with Xiaomi Poco X3 NFC and never face any issue.
I bought a Runpod for my friend and he’s using Realme X2 Pro but not able to detect it. He tried on another Realme phone and still not able to connect.

I need some help here. Does it has anything to do with the brand or Bluetooth?
Thanks in advanced.