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Understanding Callback URL validation for send OTP

Hello folks,
I'm using this as my callback URL - ""

Now it works perfectly fine for SEND_SMS endpoint, but its throwing error for SEND_OTP endpoint -
"message": "Invalid payload: callback_url ensure this value has at least 1 characters",
"status": 400,
"code": 400

I dont understand whats the issue here.
Help is much appreciated.

For reference the sample request body looks like -

"msisdn": "62111122222",
"callback_url": "",
"template": "My otp is - $OTP",
"otp": "1234"