Can't download updates over LTE

[PureTek-Innovations]

I'm using the library on an EPS32S3 with a SIMCOM7600G-H module using PlatformIO

framework-arduinoespressif32 @ 3.2.0
framework-arduinoespressif32-libs @ 5.4.0+sha.2f7dcd862a
OTAdrive @ 1.1.34

The LTE connection is good, I can send MQTT data and ping websites.
I've added the clients as per the example

TinyGsmClient client(modem,0);
TinyGsmClient gsm_otadrive_client(modem, 1);

And this is the relevant loop
if (OTADRIVE.timeTick(60)) // 30 seconds for testing
{
// retrive firmware info from OTAdrive server
auto inf = OTADRIVE.updateFirmwareInfo(gsm_otadrive_client);

  // update firmware if newer available
  if (inf.available)
  {
    ESP_LOGI(LTEOTA_TAG,"New version available, %dBytes, %s", inf.size, inf.version.c_str());
    OTADRIVE.updateFirmware(gsm_otadrive_client);
  }
  else
  {
    ESP_LOGI(LTEOTA_TAG,"No newer version");
  }
}

I get the following errors:

E (684754) ARDUINO: connect to otadrive.com faild
I (685342) OTA: New version available, 1000800Bytes, 0.0.11
E (686661) ARDUINO: connect to otadrive.com faild

Sometimes I get this
I (1055103) OTA: New version available, 1000800Bytes, 0.0.11
E (1056355) ARDUINO: Update.begin failed! (No Error)
E (1056356) ARDUINO: premature end: res:0, pos:0/1000800
E (1056356) ARDUINO: Update failed

In the latest events console, I see this
deviceID=> FOTA_Start: Download firmware started
deviceID=> FOTA_Start: Download firmware started
deviceID=> FOTA_Start: Download firmware started
deviceID=> FOTA_Start: Download firmware started
deviceID=> FOTA_HasCheckedNewVersionExists: FOTA_HasCheckedNewVersionExists
deviceID=> FOTA_HasCheckedNewVersionExists: FOTA_HasCheckedNewVersionExists
deviceID=> FOTA_NoFirmware: FOTA request failed. No firmware has been set for the group

Any ideas that I can try?