Using COUNTIF (?) to list missing training in scheduling spreadsheet

Hi all,

attached is a sample spreadsheet I am building to help me schedule training sessions for team members across different teams in a large organisation. You will see the training sessions scheduled in columns M and P to give you an example of how I would mark each training session.

What I am looking for is a formula for column E, which (for each team member) compares the range F through to NF to a list of predefined training session names (see sheet 2) and lists the missing values in column E. So for example, for all three team members in the sample, the formula should pick up that there is no training scheduled for "mandate", and it should display this in column E. If multiple training sessions are missing, it would be great to have them comma-separated.

I'm open to any other suggestions, as I am a novice excel user and unsure if countif is the most appropriate solution. A bit of background in case it matters - I am considering using a table format for each of the departments, to allow me to sort the newstarters by start date or manager, as sometimes only a particular team may require training, but generally it makes sense to sort by start date. The hiring in this organisation is very staggered, which is why I use the coloured cells in F-NF to mark when a team member started and where they are at in their onboarding (green for month 1, yellow for month 2 and so on).

Previously, I did it the other way around, with a concatenate formula in column E showing me all training the team member had been scheduled for/attended. However, this became quite messy and it meant I had to manually compare column E to the list of available training for each team member.

Looking forward to any and all suggestions, thank you in advance!