Thanks for the help on this Henning!
In the end we managed to solve this by temporarily turning off the notifications from the plugin in Site administration > notification settings > Reminder of an upcoming appointment.
Luckily it doesn't send out the reminders that were missed when we turn the notifications back on so it's a working as required now
In the end we managed to solve this by temporarily turning off the notifications from the plugin in Site administration > notification settings > Reminder of an upcoming appointment.
Luckily it doesn't send out the reminders that were missed when we turn the notifications back on so it's a working as required now