Simbrief - INVALID F_PLN UPLINK

Hi! My Simbrief has always worked with Prosin A320 without problems but today I got the above error message in the MCDU when trying to import the Flight Plan. I checked and my Simbrief Pilot Number is still entered in the Prosim systems configuration. I tried generating a different flight plan but got the same message.

I just updated to 2407 AIRAC. If I understand this correctly from 2407 Navigraph introduced a new navigation database for Prosim users and publicised this in your 2407 Newsletter. It seems the major change was to shift to DFD (=Digital Flight Data). I’m wondering (from reading the Prosim forum) if that shift seems to have caused incompatibility issues? Does anyone have any ideas how I can fix this?
Thanks, Rich