Okay, firstly, I’m not here to argue but to learn. I highlighted the your phrase “accepted as Biblical” because what I want to ask - is apostolic a Biblical concept or part of the “Magisterium” or Tradition.
Also, in my limited understanding of the Reformation, apostolic succession was not a primary issue, was it? Again, I bring this up to understand rather than argue or debate. Maybe there are others who can give the answers you were looking forward in your question here.
It is both, actually, it starts in the OT:
Numbers 27:
18 So the LORD said to Moses, “Take Joshua son of Nun, a man in whom is the spirit of leadership,[a] and lay your hand on him. 19 Have him stand before Eleazar the priest and the entire assembly and commission him in their presence…………22 Moses did as the LORD commanded him. He took Joshua and had him stand before Eleazar the priest and the whole assembly. 23 Then he laid his hands on him and commissioned him, as the LORD instructed through Moses.
The example of St. Paul, before his first missionary journey:
at Acts 13:
1 Now in the church at Antioch there were prophets and teachers: Barnabas, Simeon called Niger, Lucius of Cyrene, Manaen (who had been brought up with Herod the tetrarch) and Saul. 2 While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for me Barnabas and Saul for the work to which I have called them.” 3 So after they had fasted and prayed, they placed their hands on them and sent them off.
And then Paul telling Titus to to do the same thing:
In Titus 1:5, Paul tells Titus: “For this cause I left thee in Crete, that thou shouldst set in order the things that are wanting, and shouldst ordain priests in every city, as I also appointed thee.”
And then Clement of Rome:
earlychristianwritings.com/text/1clement-lightfoot.html
1Clem 42:4 So preaching everywhere in country and town, they appointed their firstfruits, when they had proved them by the Spirit, to be bishops and deacons unto them that should believe.
1Clem 44:2 For this cause therefore, having received complete foreknowledge, they appointed the aforesaid persons, and afterwards they provided a continuance, that if these should fall asleep, other approved men should succeed to their ministration.