Hi jamesl38443327 ,
Sorry for the inconvenience .
Please let us know the workflow as in how you are trying to export to PDF ?
Try navigating to this link and check if you are able to export from here : https://cloud.acrobat.com/exportpdf by logging in with your Adobe ID and password.
Also try to clear the cache and cookies from the browser and then try again .
If you doing it through Reader let us know the exact version of Reader you have and the OS version on your system?
Let us knwo if you able to do it using the link .