STM32WB55RG USART unable to operate

[Judo]

Hello team,
I am trying to integrate the STM32WB55RG board with a sensor. To validate the sensor data I need the USART peripheral. 
The USART is working when I try to implement the example code given. But the USART is not working when I try to use it in my code.
Thank you

[Andrew Neil]

So compare & contrast your code with the "example code given".

See where they differ.

Fix the differences.