Galaxy s6 system updated two weeks ago and then my Mic stopped working. No rogue apps, every thing works as it should through blue tooth and wired headsets but not built in. I cleaned the hole to no avail. What next?

I have a Samsung Galaxy S7 Active which is currently on Android version 7.0 and Baseband version G891AUCS2BRA7 (February 5, 2018 release). As per https://www.att.com/devicehowto/tutorial.html#!/stepbystep/id/stepbystep_KM1136420?make=Samsung&model=SamsungG891A, the most current version is Android ve