Passwordless SMS: Trying to log in returns this error "no phone_number or no verification_code provided"

For the last week or so, using the Passwordless SMS (Twilio) option has been returning the following error:
“Error logging in
Error: no phone_number or no verification_code provided”

This was working previously and we have made no changes in Auth0 nor Twilio recently.

We are using the auth0-react library but we also get the same error in Auth0 when using the “Try” feature in the “Passwordless Connections” screen. We verified the Twilio settings are still correct and they are. We tried using the “Use Messaging Service” and “From” as the SMS source and same error.