The England International thought he had scored a hat trick but the rules in Germany differs from the one in the English Premier League where he was coming from. According to Bundesliga rules, Kane technically has not yet scored his first hat-trick for Bayern, and the regulations seem to make it difficult for any player.
A player must score their three goals in sequence and in the same half before it is considered as a hat trick in Germany. This means that because Kane’s goals were spread across both halves and with other Bayern players scoring inbetween, he technically is yet to get his first hat-trick for the Bavarians.