The 2021-22 campaign will be Register's first season with the Devils after spending the past 10 seasons in North America, most recently with the Allen Americans of the ECHL

Register is a 3 time Kelly Cup Champion, winning the ECHL title three years in a row, starting in 2016 with the Allen Americans, then winning back to back titles in 2017 and 2018 with the Colorado Eagles.  He was selected as the league’s Defenceman of the Year 3 times, including two seasons in a row in 2016-17 and 2017-18 and was voted the playoff MVP in 2018.

He has been selected to the ECHL First All-Star Team four times and the Second All-Star Team twice, including this past season when he finished second in scoring for ECHL defenceman with 52 points in 66 games. He led all defenders and finished 2^nd in the league in assists with 47 including 25 helpers on the powerplay. 

Register signed a two-year deal with the Iowa Wild of the American Hockey League prior to the 2019-20 season, playing 30 games for the Wild that year.