WHY ARE FONTS MISSING IN PAGES?
Try rebuilding your font caches by starting up in safe mode and restarting normally. Then choose Format > Font > Show Fonts to display the Font panel. Select All Fonts in the Collections list and you should see the fonts listed. If they aren’t shown, check whether the fonts are available outside of Pages by looking them up in Font Book — make sure you select All Fonts at the top of the app’s sidebar to see all that are installed.