---
page_type: error
code: 63035
message: >-
  63035: This operation is blocked because the RCS agent has not launched, the
  recipient has not accepted the invitation to become a tester, or the RCS
  sender only works in certain regions.
level: ERROR
product: Programmable SMS
---

## Description

This operation is blocked because the RCS sender has not launched and the recipient has not been invited and accepted the invitation to become a tester. This may also happen if you are attempting to send to a device with a country code for a region that is not supported by that sender.

### Possible Causes

The RCS sender is not approved to send RCS messages to this carrier. The RCS recipient has not accepted the invite to become an RCS tester.

Adding AT\&T test devices to your RCS sender is currently not supported. In order to send RCS messages to AT\&T end-users your sender must be approved for RCS on AT\&T. Support for adding test devices will be introduced at a later date in 2026.

### Possible Solutions

If device is RCS capable, accept invitation to become a tester. If the device has already accepted the invitation, please confirm that you are not attempting to send from an RCS sender that is regionally restricted.