Will people who miss salvation in the church age get a second chance during the tribulation?
No. During the church age, those who miss salvation or conversion do not receive a second chance in the tribulation. Paul, writing by the Holy Spirit in 2 Thessalonians 2, identifies who will not be recipients of the 144,000's message, linking the close of the church age with the tribulation.
Les explains that Revelation 7 shows a multitude of converted people coming out of the great tribulation, with robes washed white in the blood of the Lamb. They are martyred almost as fast as they are converted throughout the tribulation. This raises the question: if someone missed being saved or converted during this age of grace, is there a second chance? Les answers plainly that there is not. Paul, by the Holy Spirit in 2 Thessalonians chapter 2, identifies who will not be recipients of the message of the 144,000. Paul is not associated with prophecy as such, but with the doctrines of grace and the mysteries, yet he still connects the end of the church age with the tribulation age by describing what will take place as the Antichrist comes on the scene.