Plapp rode as a stagiaire for UCI WorldTeamIneos Grenadiers in 2021 before joining them full-time in 2022.[8] On 16 January 2022, he won the Australian National Road Race Championships after chasing down and passing James Whelan with under 10 kilometres (6.2 mi) left, before finishing solo.[9] Plapp made his World tour debut in February 2022 at the UAE Tour where he rode in support of teammate Adam Yates who finished 2nd overall. Plapp himself managed his first World Tour top 5 on the 7th and final stage to Jebal Hafeet in which he finished in 5th place, 16 seconds behind winner Tadej Pogačar.