Contacts not working after loading Big Sur
After upgrading to Big Sur my Contacts app doesn't work. It doesn't show any contacts I've added on my iPhone 11 or iPad Air (3rd generation) and when I try to add one it doesn't let get beyond the first name but jumps elsewhere on my contacts list. Has anyone else had this problem and/or found a solution.
My iPhone and iPad both run the latest IOS (v 14.5).
Many thanks
Sue
MacBook Pro 13″, macOS 11.4