Problem Communicating between Two XBee modules using Two Teensy 4.1 Microcontrollers

[Tensor1729]

Code Run on Receiver and Transmitter XBee modules through Teensy 4.1
Circuits (both Tx and Rx pins were connected for both Receiver and Transmitter)
https://drive.google.com/drive/folders/1GVXvav-3cdj7G1i47VZEdnvsrRw7lAn-?usp=drive_link

Expected Output on Receiver : “Received : Hello Xbee!”
Actual Output : No Output

The above setup for Serial Communication was also tried on Arduino and ESP8266 Modules as Microcontrollers and still no results.

A Reference Documentation for Teensy 4.1 : Teensy® 4.1

How to fix this issue?

[mvut]

The Arduino Libraries generally require that the radio be in API mode. Have you enabled API mode (AP1) on the radios?