[1] Oxner began playing soccer with the U6 programme of local club Halifax Dunbrack.

[2] While attending Saint Mary's University, Oxner played for local Nova Scotia Soccer League amateur side Western Halifax FC during the summer.

[4] In 2017, Oxner won a second provincial title in a row Western Halifax and went on to win the Challenge Trophy that year.

[4] Oxner kept a clean sheet in the final against FC Winnipeg Lions as Western Halifax won 1–0, becoming the first Nova Scotia club to win the competition since in 2001.

[11] In December 2022 HFX announced they had declined Oxner's 2023 option, ending his time with the club.