Hello,

As error says the To is not sent. Please use the custom provider.

send_to_name is the variable label/name for the to mobile number like mobile=+601111442122 I think in your case it's to

msg_name is the variable label/name for the message body like message=This is sms text or body=This is sms text I think in your case it's body

You need from like From=+<TWILIO_PHONE_NUMBER> and the account_sid & auth_token

This image might be helpful.

If you can try from terminal this is from their site

curl -X POST https://api.twilio.com/2010-04-01/Accounts/{{ACCOUNT_SID}}/Messages.json \
--data-urlencode "From=+<TWILIO_PHONE_NUMBER>" \
--data-urlencode "Body=body" \
--data-urlencode "To=+<YOUR PHONE_NUMBER>" \
-u your_account_sid:your_auth_token

So you can try with these

URL         = https://api.twilio.com/2010-04-01/Accounts/YourAccountSIDHere/Messages.json
Send to name = To
Message name = Body
Param1 label = account_sid
Param1 value = YourSID
Param2 label = auth_token
Param2 value = YourAuthToken
Param3 label = From
Param3 value = YourFromNumber

Thank you