Update genius greyed out on Mac
I have an iMac (Retina 5K, 27-inch, 2017 running on Mojave v10.14.5 and iTunes is v12.9.5.5. I use iTunes Match with 3 devices authorised to play content purchased with my Apple ID and all my music is stored on the iCloud. I am trying to put together some playlists for my upcoming holiday and find I am unable to create genius playlists.
After checking the help I have found that 'file>new>genius playlist' is greyed out and in 'file>library both 'update iCloud music library' and 'update genius' are greyed out. Why is this and what do I need to do to enable me to create genius playlists?
NB. I have selected 'iMac Pro' as my device because the one I have is not in the device list.
iMac Pro