Can't find olf backups of Iphone after switching to Apple Devices on PC

I have just installed Apple Devices, at the same time I need to restore my iphone from a backup however when I open Apple Devices on my Win 11 machine, I can't see the old backups as an option under Manage Backups. I can see the backups still exist on the machine when I search for the folders, but I can't access them in Apple Devices to restore from - how do I get this to work?