outlook 365 on mac - not downloading all folders

I have installed outlook 365 on the mac, however only some of the folders are actually downloading to the mac (icloud account) . They are there on mail app (mac's own) and my iphone. So:

inbox, drafts, sent, junk, trash archive - all there as usual on all devices / apps

iphone : folders 1, 2, 3, 4, 5, 6, 7, 8, 9

mail app on mac : folders 1, 2, 3, 4, 5, 6, 7, 8, 9

OUTLOOK: 1, 3, 4, 6, 8

Any idea, and many thanks