Widgets

Hi, I have read the forum and seen someone had a similar issue to what I am having. I followed the steps suggested in that thread but I am not having any joy. This is the post I read. I am having similar issues. I want to place a widget in the header but when I go to Customise>Widgets I see a message the reads ‘Your theme has 9 widget areas, but this particular page doesn’t display them.You can navigate to other pages on your site while using the Customizer to view and edit the widgets displayed on those pages.’ But when I navigate to those other pages it gives me the same message. When I am navigating I briefly see the option for ‘Header 1’ etc appear but then it disappears. I have checked and the theme is up to date.