Only single GPS connection, no dual

Hi everyone

Its the first time setting-up agopengps for me. I’d like to go with the dual antenna setup.
However, when using the config-o-matic tool to setup the two GPS modules as ‘left’ and ‘right’, mounting them on the V4.5 PCB, powering it up, It can only connect to the ‘steering-module’ in AgIO but not to GPS.

If I only use one gps module, configure it as ‘single’ and then connect it, I can get the GPS position in AgIO. I tried it with both my modules, and they work both.

Is there a trick to making dual antenna work?

Best
Marius