I tried notifying the user in a channel using user ID (for eg. hey <@U123456|bob>, how are you?). here @U123456 is the user ID. This is getting notified by the user.
But when i try to notify <@C123456|channel>, its not notifying. here @C123456 is the channel ID and channel is the default tag that is used to notify all the users in that channel.
@channel is used to notify all the users in a particular channel. I am failing at it.
Please help.
The problem has been resolved,
<@C1234567> isn't a valid way to notify a channel, instead use <!channel> within that channel to trigger a notification.