Error50400: Programmable Chat: User not member of channelPositive FeedbackNegative FeedbackTwilio Chat DocumentationChat Descriptiondescription page anchorPositive FeedbackNegative Feedback Possible causespossible-causes page anchorPositive FeedbackNegative Feedback Specified User is not member of this Channel. Possible solutionspossible-solutions page anchorPositive FeedbackNegative Feedback Confirm a valid User who is Member of this Channel is being passed in request.