# 50420: Messaging Binding type does not support the provided parameters

Log Type: APPLICATION

Log Level: ERROR

## Description

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`.

### Possible causes

* 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.

### Possible solutions

* 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`.

#### Additional resources

* [Conversation Participant Resource](/docs/conversations-classic/api/conversation-participant-resource)
* [Conversations Attributes](/docs/conversations-classic/attributes)
* [Twilio Conversations Overview](/docs/conversations-classic/overview)