You attempted to configure your hosted number, but the URL you specified was not valid.
Invalid URL provided for phone number configuration (SmsUrl, SmsFallbackUrl, VoiceUrl, VoiceFallbackUrl).
Invalid URL provided for status callback configuration (StatusCallbackUrl).
Make sure you submit a fully qualified URL including:
protocol (http:// or https://)
hostname
file path
properly url-encoded query parameters
Twilio must be able to reach this URL over the public Internet.