4010: RCS capability check unavailable
The RCS capability check could not run on the sender line.
The RCS capability check could not run on the sender line. This is an HTTP 503 error indicating a fault on the sender line, not a statement about the recipient.
Troubleshooting
Section titled “Troubleshooting”- Retry the request after 30 seconds.
- If it persists, send from a different line on your account and contact support.