UPS Surepost TimeInTransit API - ups

Question

We have had UPS Surepost enabled to our account and a MailerID assigned. However when making POST requests to UPS endpoint: https://onlinetools.ups.com/rest/TimeInTransit we do not get any UPS Surepost services in return. Do we need to add the MailerID to the request somewhere (we have tried with same response). I have tried to reach out to the UPS tech support for documentation and support with no success.
{
"Security":{
"UsernameToken":{
"Username":"XXXXXXXXX",
"Password":"XXXXXXXXX"
},
"UPSServiceAccessToken":{
"AccessLicenseNumber":"XXXXXXXXX"
}
},
"TimeInTransitRequest":{
"Request":{
"RequestAction":""
},
"ShipFrom":{
"Address":{
"AddressLine":null,
"City":"Las Vegas",
"PostalCode":"89103",
"CountryCode":"US",
"ResidentialAddressIndicator":false
}
},
"ShipTo":{
"Address":{
"AddressLine":"XXXXXXXXX",
"City":"Las Vegas",
"PostalCode":"89144",
"CountryCode":"US",
"ResidentialAddressIndicator":true
}
},
"Pickup":{
"Date":"20211118"
},
"InvoiceLineTotal":{
"CurrencyCode":"USD",
"MonetaryValue":"100"
},
"ShipmentWeight":{
"UnitOfMeasurement":{
"Code":"KGS",
"Description":""
},
"Weight":"1"
}
}
}