IDN conversion failed API Status

Hey all!
I need help because having this strange issue error: API Connection Status: IDN conversion failed.

How can I solve this?
There is no caching system nor cdn connected.
Debug info

<?xml version="1.0"?>
<RatingServiceSelectionRequest xml:lang="en-US">
  <Request>
    <TransactionReference/>
    <RequestAction>Rate</RequestAction>
    <RequestOption>Shop</RequestOption>
  </Request>
  <Shipment>
    <Service>
      <Code/>
      <Description/>
    </Service>
    <Shipper>
      <ShipperNumber>3E549W</ShipperNumber>
      <Address>
        <AddressLine1>P.O. Box 300. Abilene, Texas 79604</AddressLine1>
        <City>Abilene</City>
        <StateProvinceCode>TX</StateProvinceCode>
        <PostalCode>79604</PostalCode>
        <CountryCode>US</CountryCode>
      </Address>
    </Shipper>
    <ShipFrom>
      <Address>
        <AddressLine1>P.O. Box 300. Abilene, Texas 79604</AddressLine1>
        <City>Abilene</City>
        <StateProvinceCode>TX</StateProvinceCode>
        <PostalCode>79604</PostalCode>
        <CountryCode>US</CountryCode>
      </Address>
    </ShipFrom>
    <ShipTo>
      <Name/>
      <CompanyName/>
      <AttentionName/>
      <Address>
        <AddressLine1>1220 Lake Bradford Rd</AddressLine1>
        <City>Tallahassee</City>
        <StateProvinceCode>DC</StateProvinceCode>
        <PostalCode>32304</PostalCode>
        <CountryCode>US</CountryCode>
      </Address>
    </ShipTo>
    <Package>
      <PackagingType>
        <Code>02</Code>
        <Description/>
      </PackagingType>
      <PackageWeight>
        <Weight>2</Weight>
        <UnitOfMeasurement>
          <Code>LBS</Code>
          <Description/>
        </UnitOfMeasurement>
      </PackageWeight>
      <PackageServiceOptions/>
    </Package>
    <ShipmentServiceOptions/>
  </Shipment>
</RatingServiceSelectionRequest>
 

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