UART of SAMD is not working at 460800 baud rate

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I am referring to the application note AT11626: SAM D SERCOM USART Configuration. In my setup SAMD21J18A is communicating over uart with other microcontroller. The code given in application pdf worked for 9600 baud rate but if I increase it beyond 115200 baud rate the data transmission/reception fails. I thought that the other microcontroller which I am using is not functioning correctly but after I verified it, I found that samd code is posing a problem. Please help.

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How fast is the SAMD clocked? Run it faster if you can (both the SERCOM and the CPU).

/Lars