Problem Communicating between Two XBee modules using Two Teensy 4.1 Microcontrollers

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)

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?

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