Tongues were for the Jews, communicating with those of every nation under heaven....”
That sounds like a contradiction smvoice......communicating with ‘every nation’ would mean ‘various languages’ ....though the scripture indicates there were Jews there I understand from your reference this would also means others besides Jews...as it states...
...” ten men will take hold out of ALL the languages of the nations.....(which indicates ‘other’ than Jews)...of the skirt of him that is a Jew, (would indicate other than a Jew taking the hem of his skirt) saying...”We will go with you for we have heard that God is with you”.
It isn't a contradiction at all. When Peter stood up on the day of Pentecost and announced that "this is that which was spoken by the prophet Joel" (Acts 2:17,18) he was quoting the prophecy of Joel 2:28,29. Peter and the 11 believed that Christ was about to return. The Holy Spirit had been poured out, all languages were being spoken (Acts 2:7,8) and Jerusalem was set to accept Christ as Messiah. OF course, they did not, as a whole, and the rest of Joel was left unfulfilled until a later time. But the point is, everything was in place that GOd said would be in place just before Christ's return to Jerusalem to establish His kingdom. We have to put ourselves in their place on that day. Jews are speaking in tongues to other Jews from other nations, miracles signs and wonders were present and the only thing left was for Christ to return, once Israel believed.Thank God they rejected Him at that time. Because the times of the Gentiles had yet to be fulfilled. But for them, everything that had been prophesied was coming to pass. Why do you think they sold everything and had all things in common? They were convinced His return was eminent and were awaiting going into the Kingdom to become a kingdom of priests and a blessing to all nations.
We just need to put ourselves in that place at that time to understand what was going on.