17503: Invalid mediaUrl (unsupported scheme or malformed)

Twilio couldn't create a new transcription because the value of mediaUrl is either malformed or uses an unsupported scheme.

• The URL uses an unsupported scheme such as ftp://, file://, or data://.
• The URL is a relative path instead of an absolute URL.
• The URL is malformed and can't be parsed.

• Use a fully qualified URL that begins with https:// or s3://.
• Make sure the URL is properly encoded and doesn't contain illegal characters.

• Transcribe an external recording
• Create a transcription with a mediaUrl