When someone calls, can't answer in lockscreen

[AC Question]

I have the moto e second gen running android 5.0.2 . about a week ago my phone stopped allowing the dialer app to be access though the lock screen, meaning I have to unlock the phone first to answer calls. This means I regularly miss calls. Before the dialer app would appear on screen when called. I've looked though settings and have been googling the issue but have yet to find a solution. Has anyone else had this issue and is there a way to allow me to answer calls without the need to unlock my phone?