I am in the process of starting the MP II 3x 48/10000/140-100 system with LFP4 82kWh batteries. I have encountered a strange problem with connecting inverters to OSD (ČEZ) - ONGRID . In OFFGRID (Inverter only) mode MPII starts without any problem and the system is quickly ready for operation and works correctly, but when I switch to ONGRID mode the inverters do not connect to ČEZ for a very long time and their ONGRID connection seems to me to be “random” and very time-consuming. What could be the problem (Cerbo GX -Firmware version v3.34, MultiPlus-II 48/10000/140-100 - Firmware version 552). On the ČEZ side there is of course HDO.