50420: Messaging Binding type does not support the provided parameters

This error occurs when you create an SMS participant with unsupported MessagingBinding fields such as MessagingBinding.Name or MessagingBinding.Level. When you add an SMS participant, use messagingbinding.address for the participant phone number and messagingbinding.proxyaddress for your Twilio number. If you need to store a display name or other metadata for a non-chat participant, use participant attributes.

• Your request includes MessagingBinding.Name for an SMS participant.
• Your request includes MessagingBinding.Level for an SMS participant.
• Your request mixes SMS participant parameters with fields that are not supported for that participant type.

• Remove MessagingBinding.Name and MessagingBinding.Level from the request.
• For an SMS participant, provide the participant phone number in messagingbinding.address and your Twilio number in messagingbinding.proxyaddress.
• If you are adding a chat participant instead, create the participant with identity.
• If you need to store a display label or other participant metadata, save it in participant attributes.

• Conversation Participant Resource
• Conversations Attributes
• Twilio Conversations Overview