Hi,
I'm a L&D Manager trying to build automation into my bookings system for internally run courses. I have used MS Bookings to build out the calendar of courses and each course is down as a service, within that I have multiple sessions running over different dates and times for example:
Leading myself and others through change has 5 different dates and times ie 12th September 10:00-12:00 / 17th September 10:00-12:00 etc.
I'm trying to build a flow to automate when a person books onto an appointment within a 1:N service that this triggers my MS List to update the number of seats remaining on that service by decreasing it by one, so once it is full, the seats remaining is 0 and the user knows they can't book onto it.
I've tried various triggers through PowerAutomate and the options within it, but the flow doesn't work. I've attached screenshots of how I have set everything up.
Any help to get this working would be greatly appreciated so we don't have to manually update the List when a booking is made. I do also want to build a flow to automate when someone cancels or amends to a new date, that the seats remaining goes up by one.

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