Need to have a user in /etc/asterisk/manager_additional.cfg that matches /usr/local/fop2/fop2.cfg and enable manager_additional.cfg. Restart Askterisk then Test.
nano /etc/asterisk/manager_additional.conf && nano /usr/local/fop2/fop2.cfg && sh -c 'echo "include manager_additional.conf" >> /etc/asterisk/manager.conf' && service asterisk restart && /usr/local/fop2/fop2_server --test
/etc/asterisk/manager_additional.conf
Make them Match
#/etc/asterisk/manager_additional.conf
[fop2] secret = amp111 deny=0.0.0.0/0.0.0.0 permit=127.0.0.1/255.255.255.0 read = system,call,log,verbose,command,agent,user,config,dtmf,reporting$ write = system,call,log,verbose,command,agent,user,config,dtmf,reportin$ writetimeout = 100
#/usr/local/fop2/fop2.cfg
manager_user=fop2 manager_secret=amp111