RadioLib: Seeed-Studio LoRa-E5-Mini LoRaWAN OTAA timeout

Using the E5 dev board (https://www.seeedstudio.com/LoRa-E5-mini-STM32WLE5JC-p-4869.html), I can get chirpstack to recieve a JoinRequest and issue a JoinAccept however RadioLib provides a timeout error (-6).

I don’t know if I am setting the RFSwitches correctly:

////////////////////////////////////////////////////////////////////////////////////////////

#include <Arduino.h>
#include <RadioLib.h>

// no need to configure pins, signals are routed to the radio internally
STM32WLx radio = new STM32WLx_Module();

// create the node instance on the US-915 band
// using the radio module and the encryption key
// make sure you are using the correct band
// based on your geographical location!
LoRaWANNode node(&radio, &US915);

// using PA0 as a placeholder since the E5-mini does not have the PC3 connection
//ref: https://github.com/Seeed-Studio/LoRaWan-E5-Node
static const uint32_t rfswitch_pins[] = {PA0, PA4, PA5}; //TX received in chirpstack
//static const uint32_t rfswitch_pins[] = {PA0, PA5, PA4}; // no response
//static const uint32_t rfswitch_pins[] = {PA4, PA0, PA5}; //TX received in chirpstack
//static const uint32_t rfswitch_pins[] = {PA4, PA5, PA0}; // no response
//static const uint32_t rfswitch_pins[] = {PA5, PA0, PA4}; //TX received in chirpstack
//static const uint32_t rfswitch_pins[] = {PA5, PA4, PA0}; //TX received in chirpstack

static const Module::RfSwitchMode_t rfswitch_table[] = {
  {STM32WLx::MODE_IDLE,  {LOW,  LOW,  LOW}},
  {STM32WLx::MODE_RX,    {HIGH, HIGH, LOW}},
  {STM32WLx::MODE_TX_LP, {HIGH, HIGH, HIGH}},
  {STM32WLx::MODE_TX_HP, {HIGH, LOW,  HIGH}},
  END_OF_MODE_TABLE,
};

void setup() {
  Serial.begin(115200);

  // set RF switch control configuration
  // this has to be done prior to calling begin()
  radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);

  int state = radio.begin();
  if(state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while(true);
  }

  // first we need to initialize the device storage
  // this will reset all persistently stored parameters
  // NOTE: This should only be done once prior to first joining a network!
  //       After wiping persistent storage, you will also have to reset
  //       the end device in TTN and perform the join procedure again!
  // node.wipe();

  // application identifier - pre-LoRaWAN 1.1.0, this was called appEUI
  // when adding new end device in TTN, you will have to enter this number
  // you can pick any number you want, but it has to be unique
  uint64_t joinEUI = 0x12AD1011B0C0FFEE;

  // device identifier - this number can be anything
  // when adding new end device in TTN, you can generate this number,
  // or you can set any value you want, provided it is also unique
  uint64_t devEUI = 0x70B3D57ED005E120;

  // select some encryption keys which will be used to secure the communication
  // there are two of them - network key and application key
  // because LoRaWAN uses AES-128, the key MUST be 16 bytes (or characters) long

  // network key is the ASCII string "topSecretKey1234"
  uint8_t nwkKey[] = { 0x74, 0x6F, 0x70, 0x53, 0x65, 0x63, 0x72, 0x65,
                       0x74, 0x4B, 0x65, 0x79, 0x31, 0x32, 0x33, 0x34 };
                       //746F705365637265744B657931323334

  // application key is the ASCII string "aDifferentKeyABC"
  uint8_t appKey[] = { 0x61, 0x44, 0x69, 0x66, 0x66, 0x65, 0x72, 0x65,
                       0x6E, 0x74, 0x4B, 0x65, 0x79, 0x41, 0x42, 0x43 };
                       //61446966666572656E744B6579414243

  // prior to LoRaWAN 1.1.0, only a single "nwkKey" is used
  // when connecting to LoRaWAN 1.0 network, "appKey" will be disregarded
  // and can be set to NULL

  // some frequency bands only use a subset of the available channels
  // you can set the starting channel and their number
  // for example, the following corresponds to US915 FSB2 in TTN
  /*
    node.startChannel = 8;
    node.numChannels = 8;
  */

  // now we can start the activation
  // this can take up to 20 seconds, and requires a LoRaWAN gateway in range
  Serial.print(F("[LoRaWAN] Attempting over-the-air activation ... "));
  state = node.beginOTAA(joinEUI, devEUI, nwkKey, appKey);
  if(state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while(true);
  }

/////////////////////////////////////////////////////////////////////////////////////////// The remainder of the STM32WLx_Transmit_Interrupt.ino code is unchanged.

Serial terminal output:

[LoRa-E5] Initializing ... success!
[LoRaWAN] Attempting over-the-air activation ... failed, code -6

///////////////////////////////////////////////////////////////////////////////////////////

Is this a RF Switch issue?