# 50721: RCS capability check failed and no fallback proxy address provided.

Log Type: TWILIO

Log Level: ERROR

## Description

RCS capability check failed and no fallback proxy address provided.

### Possible causes

The proxy address provided is not RCS-capable and fallback proxy address has not been provided. Usually, a fallback proxy address would be an SMS phone number.

### Possible solutions

Provide a fallback proxy address and/or make sure the receiving device is RCS-capable and within an RCS-supported region.