FTTP down since installed ?, if that means you have had an installation that was never successfully completed , then the original job shouldn’t have been closed and Openreach should be resolving the issue that stopped the installation being successful, if the job was incorrectly booked off as completed when it wasn’t , then you would need to get BT to raise a fault, but you cannot raise a fault on something that has never been installed, so it would seem the installation hasn’t been closed and is still an active order.
If all the internal work , fitting the ONT etc, has been done it’s possible that you won’t need to be available for the engineer, but if there is still internal work and access to your home is needed then Openreach may need BT to make an new appointment with you , or they may simply turn up and if you are not in , leave a card with a number to call.
What lights are lit in the ONT , assuming the ONT was fitted .
AFAIK, Openreach cannot make ‘proper’ appointment with you , that needs BT , but they could , for example, on the original visit state that they would be back in the morning etc
