21910: Invalid 'From' and 'To' pair. 'From' and 'To' should be of the same channel
PROGRAMMABLE SMS
ERROR
From
and To
parameters in the API Request should be of the same channel.
You are trying to send a message between different channels, eg. from an SMS capable number to a WhatsApp number.
Ensure From
and To
parameters are the same channel, eg. both are SMS or both are WhatsApp.