Why are my flagged messages not showing in the Remember app?

I am on Office365 Enterprise, BES12 Cloud Services, BB10 OS 10.3.2, BB Classic on a regulated Work / Personal activation.

I have a load of flagged messages, some flagged in OWA, some on the device, none of them show up in the flagged messages folder in Remember.

Remember has a number of synced folders of tasks, and they sync fine between Office365 and the app, but no flagged messages.

I have had it working in the past on an Activesync straight to office 365 but no joy with BES12.

Any tips? Many thanks.