My requests to Shippo API doesn't return any rates for EU. Just successfully managed to get rates for USA and UK. But I need to make delivery from Czech Republic to other countries.
In my GoShippo account I currently have these carriers:
    Parcelforce 
    USPS
    Deutsche Post
    UberRUSH
    DHL Express
So this request...
{
  "object_purpose": "PURCHASE",
  "address_from": {
    "object_purpose": "PURCHASE",
    "name": "Mr Hippo",
    "street1": "80 Duke of York Square",
    "city": "London",
    "zip": "SW3 4LY",
    "country": "GB",
    "phone": "+1 406-452-6041",
    "email": "mrhippo@goshippo.com"
  },
  "address_to": {
    "object_purpose": "PURCHASE",
    "name": "Mr Hippo",
    "street1": "1-2 Oxford St",
    "city": "Manchester",
    "zip": "M1 5AN",
    "country": "GB",
    "phone": "+1 406-452-6041",
    "email": "mrhippo@goshippo.com"
  },
  "parcel": {
    "length": "5",
    "width": "5",
    "height": "5",
    "distance_unit": "in",
    "weight": "5",
    "mass_unit": "lb"
  },
  "async": false
}
...gives me this rates
Because it is UK. Also I successfully get rates if I use USA addresses.
But if I try addresses from France, Germany, Croatia, Hungary, Switzerland, Poland, Czech Republic, Ukraine, Sweden etc., I never get any rates. I have tried a lot of combinations of parcel weight/size, lb/kg, in/cm, also have tried one/multiple parcels in one shipment.
What should I do to get rates exactly for delivery form Czech Republic to EU countries?