Fans who aren’t fully vaccinated against the virus that causes COVID-19 will soon not be allowed into home games for the NFL’s Buffalo Bills and the NHL’s Buffalo Sabres, officials announced this week. Fans 12 and older will have to present verification that they’ve gotten a COVID-19 vaccine when entering Highmark Stadium, where the Bills play, and the Key Bank Center, the home of the Sabres. If they do not, they will not be let in. The policy starts Sept. 25 for Key Bank Center, when an Eric Church concert is set to take place. The policy kicks in a day later for the stadium; the Bills are scheduled to play there on Sept. 26. The initial policy requires at least one vaccine dose; it will transition in October to full vaccination, which refers to people getting a full regimen, typically two doses of Moderna or Pfizer’s shots. Children under …