HMI Communication Fault with PLC

Anyone know why this fault appears, I have an S7-1200 controller and MTP700 Unified Comfort HMI.

When I set up communication in TIA portal V18 everything looks okay.

The HMI is running image version 18.3 and I have WinCC Comfort V18 as well as Step7 V19

Do I need to be using WinCC unified for it to work?

Also when doing device configuration for HMI, version 18.3 isn't allowed due to file missing, so I set up with version 17.1.

Closed cause question posted twice.

The second thread with the subject HMI Communication Fault with PLC is published within the conference WinCC Unified Systems.