BLE concurrent peripheral connections

Hi all,
I am trying to connect to Android phone (there is GATT server) while debugging in Chrome IDE.
Getting ERR 0x12 (CONN_COUNT).

var gatt;
NRF.requestDevice({ filters: [{ name:'Pixel 4a' }] }).then(function(device) {
  console.log("found device");
  return device.gatt.connect();
}).then(function(g) {
  gatt = g;
  console.log("connected");
  return gatt.startBonding();
}).then(function() {
  console.log("bonded", gatt.getSecurityStatus());
  gatt.disconnect();
}).catch(function(e) {
  console.log("ERROR",e);
});

=Promise: {  }
found device
ERROR ERR 0x12 (CONN_COUNT)

If "one central and one peripheral connection", what is a central and peripheral in my case?
My understanding B2 acts as service, so it should be peripheral. Am I correct? Then why it does not allow to connect to Android service as central?