---
page_type: error
code: 50431
message: "50431: Participant SID not provided"
level: ERROR
product: Programmable Chat
---

## Error - 50431

### Conversations: Participant SID not provided

Conversation participant SID parameter is required but was not provided.

#### Possible Causes

- The API expected a participant SID input parameter, but it was either not provided or was misspelled.

#### Possible Solutions

- Add a valid participant SID parameter to the API request and confirm that it is not misspelled.