I've lost my hash and my tilde

I recognise this is really a question that should go on a more general Pi forum but as I know there one or two other Mac Aficionados resident here, it is just possible they may have encountered this:
I am using an Apple Aluminium extended keyboard with my Pi4 and despite having tried all the Apple Keyboard options in Preferences I cannot find the hash symbol. The same applies to the tilde but I need that less often.
Copy and paste is my work-around but it’s a tad tedious.
Any ideas please.