Hey there! The iPhone 6 keeps track of the original home button for the touch id. When you replaced the screen, did you get the complete assembly with home button? If you did, you phone is just protecting itself from someone trying to break into your phone. If you didn't, the gasket or home button may not be fitting well, and may not be registering as the stock part. I'd check these two possibilities, and ask again if the issue isn't resolved.
Best of luck!
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Did you make sure to keep the original home button? For iPhones with Touch ID, it requires the original home button. Almost like an extension of the logic board.
crwdns2934271:0crwdnd2934271:0 Tenyouken crwdne2934271:0
Yes i have the original home button!
crwdns2934271:0crwdnd2934271:0 Chima Okehi crwdne2934271:0