Method Not Implemented

My dragino DLOS8 gateway terminates my mkr wan 1310 device shortly after join with the txack.drop event details here:

  "name": "gs.txack.drop",
  "time": "2021-11-16T22:56:56.512443487Z",
  "identifiers": [
      "gateway_ids": {
        "gateway_id": "mccall-gw"
      "gateway_ids": {
        "gateway_id": "mccall-gw",
        "eui": "xxxxxxxxxxxxxxxxxxxx"
  "data": {
    "@type": "",
    "namespace": "pkg/gatewayserver/upstream/ttnv2",
    "name": "method_not_implemented",
    "message_format": "method not implemented",
    "correlation_id": "31e5c80961b94d0a9dcda7f4a8882a02",
    "code": 12
  "correlation_ids": [
  "origin": "",
  "context": {
    "tenant-id": "CgN0dG4="
  "visibility": {
    "rights": [
  "unique_id": "01FMNFFD60PTKA0CTZGA5X00C5"

I see this TTN V2 in the path (“namespace”:“pkg/gatewayserver/upstream/ttnv2”,) but have confirmed that my previous work on TTN V2 has been deleted. Perhaps it is gateway legacy code that carried over.

I have a MKRWAN1310 FW 1.3.0 end device configured manually with mac v1.0.2 and PHY v1.0.2 Rev B. I get the message consistently when I join via the arduino sketches LoraSendAndRecieve and FirstConfiguration.
Using MKRWAN_v2 - Version: 1.3.2.
Screenshot 2021-11-16 4.25.43 PM
Screenshot of gateway log attached.

Any idea what “method is not implemented” or other clues to the root cause?