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