BLE NRF.setServices() string UUID Error

ESP32 WROOM-32 Dev Kit | firmware v2.00
Using string UUID (16bit or 128bit representation) throws an error ERROR: empty UUID type. Integers between 0 and 0xFFFF works fine.

NRF.setServices() docs note: UUIDs can be integers between 0 and 0xFFFF, strings of the form "ABCD", or strings of the form "ABCDABCD-ABCD-ABCD-ABCD-ABCDABCDABCD"

NRF.setServices({
  "81b38ab0-908a-4c40-8f29-b19ed4524599" : {
    "81b38ab1-908a-4c40-8f29-b19ed4524599" : {
      value : 0x01,
      readable : true,
      writable : true,
      description: "Param1",
      onWrite : e => {
        console.log("P1 got: ", e.data);
      }
    },
    "81b38ab2-908a-4c40-8f29-b19ed4524599" : {
      value : 0x02,
      readable : true,
      writable : true,
      description: "Param2",
      onWrite : e => {
        console.log("P2 got: ", e.data);
      }
    },
    "81b38ab3-908a-4c40-8f29-b19ed4524599" : {
      value : 0x03,
      readable : true,
      writable : true,
      description: "Param3",
      onWrite : e => {
        console.log("P3 got: ", e.data);
      }
    }
  }
});