What does "high aerobic shortage" mean specifically?

Look at your past activities.

Those orange bars are the high aerobic activities. Do more of these activities.

They are running zones 2 and 3 for my case.

In case you don't have past activities, you can try doing tempo run.

There is some explanation of the workout labels and what types of workouts might achieve them  at www.firstbeatanalytics.com/.../

I agree. They try to be too helpful by being vague instead of clear and specific.

Well, but if we are getting suggested workouts, then this vagueness doesn't matter :D Do what the watch says and they should be balanced ;) 

After a bit more investigation, I think the area for improvement is that when checking on training status on the watch the report gives 3 categories of focus: Low aerobic, High aerobic and Anaerobic, but only gives a score for aerobic and anaerobic. It looks like Connect does not give a more detailed report on the activity either, so its not possible to know the score for each component for an activity.

My orange bars indicate “unproductive” - so is that high anaerobic!?

Why bother to respond if you don’t want to answer the question?

Albert is my NickName said:

My orange bars indicate “unproductive” - so is that high anaerobic!?

I think you are looking at the wrong orange bars.

Try these orange bars

and these orange bars

NOT these orange bars:

Ah right thank you, but I can’t seem to find where I get that much detail - can you show details of the map to get there?

Click training status, then select the word 'Load' at the bottom left of screen.  Kind of a hidden 'button' of sorts.  That will show you your compilation of training in the three load segments (anaerobic, high aerobic, and low aerobic) of the past month.   You can select the tabs at the top to see what 4443... mentioned.

But overall for high aerobic you will want either strong tempo runs or threshold intervals where you are getting a good amount of time in your 84-90% HR.  So either after warmup 8-15min... run steady medium hard at just faster than Half Marathon Pace or just slower than 10km Pace for 15-25minutes, before cooldown.  Plug in a 5km or other race PR for equivalent paces here.  https://runsmartproject.com/calculator/#modThreshold

Otherwise you can break it up into 6-15minute chunks with 1 to 4minutes of recovery easy run between.  Often these will be at a faster pace closer to 10km pace.   Should get an aerobic training effect that is above 3.7 hopefully.