Token verification failed getting Unauthorized error 1401

I am hitting the API URL below but getting the 401 unauthorized although I have given new access token that is valid, can anyone help me there, also sending the value in encrypted format as mentioned in the swagger document?
Can anyone help what is the flow of this API?

apiUrl > https://dev.ndhm.gov.in/cm/api/v1/apps/generate/otp

output getting {
“error”: {
“code”: 1401,
“message”: “Token verification failed”
}
}

body = { “value”:“iM7Q7Vn5VNTNVblqXgEscNVtFSry9fDzTa/9dmIzRbpGZcjVMyzA9291ZTQZL9/ErmzqJRBesIOFADhafcekpd0uFmgXamLhhhRZO8n5plViqAdYp+AVkX0/cAlvZiACjtWwLpihcaqTCDU53Ta9MSMrAFaRuE9A6z6W4m6FWqnRdUGwFlSSCa4iQrUloyKBaRaHL3dK5hjQ0hSvmFGXP3WxI8F1cFk76wGvN631zCPp8nrZx5kXNSO2t6R7iyEhuiNWvRmx2m4hr9tl4toUgyNByCa2NAFeCRgo5CnTu8=”,
“authMode”: “MOBILE_OTP / EMAIL_OTP”
}