MediaMath requires all segments to have a MathTag ID - you must specify this as an override when adding segments to a MediaMath destination account.
{
"account":{
"destination_id":9246,
"integration_id":9236,
"device_types":[
"web",
"ios",
"android"
],
"name":"",
"certified":true,
"properties":[
{
"name":"media_math_file_prefix",
"description":"Your company or account name at MediaMath (unless specified otherwise). This is just for troubleshooting purposes. Don't worry if you are unsure of which value to use. No spaces or other special characters, please (e.g. advertiser_name or CompanyInc).",
"value":""
}
]
}
}