FOP2 from the Elastix Marketplace does not include the standard fop2 phonebook.
It uses the phonebook from Elastix, and from it to appear you must log to Elastix first.
So, if you want the standard fop2 phonebook, you need to install FOP2 from tarball. You can download the tar.gz, extract, run make and then there are some additional steps specially for the Elastix market version:
cp /var/www/html/fop2/index.html /var/www/html/fop2/fop2.html
cp /usr/local/fop2/autoconfig* /etc/asterisk/fop2
Best regards,