I fully understand why you think it was the Apostle Phillip, but we believe it was this Phillip:
(Acts 6:2-6) . . .the Twelve called the multitude of the disciples together and said: “It is not right for us to leave the word of God to distribute food to tables. 3 So, brothers, select for yourselves seven reputable men from among you, full of spirit and wisdom, that we may appoint them over this necessary matter; 4 but we will devote ourselves to prayer and to the ministry of the word.” 5 What they said was pleasing to the whole multitude, and they selected Stephen, a man full of faith and holy spirit, as well as Philip, Prochʹo·rus, Ni·caʹnor, Tiʹmon, Parʹme·nas, and Nic·o·laʹus, a proselyte of Antioch. 6 They brought them to the apostles, and after praying, they laid their hands on them.
Of course we are subject to error in our understanding. You are absolutely correct about the Apostles being granted the privilege of forgiving sins, but of course there are no Apostles today.