In Round 13 of the 2021 NRL season, Cobbo made his first grade debut for the Brisbane Broncos on the wing against St. George Illawarra Dragons at Kogarah Oval which ended in a 52–24 loss.

[5][6] Cobbo played fullback in the 2021 Queensland Cup Grand Final for the Wynnum-Manly Seagulls, which the club ultimately lost 16-10 against the Norths Devils.

[citation needed] In Round 7 of the 2022 NRL season, Cobbo scored two tries for Brisbane in a 34-14 victory over Canterbury.

[8] Following a sensational start to the year with 10 tries in 12 games, Cobbo was selected to make his State of Origin debut in Game 1 of the 2022 State of Origin series on the right wing, setting up a crucial try 5 minutes before halftime for centre Dane Gagai.

[9] In January, Cobbo came under criticism after comments he made about Brisbane coach Kevin Walters on the Back of the 135 podcast in November 2022.

[19][20] Cobbo played 19 games for Brisbane in the 2024 NRL season which saw the club miss the finals finishing 12th on the table.