As per current ICC regulations introduced in 2020, a player must be at least 15 years old to play senior international cricket.
Vaibhav was born on March 27, 2011, meaning he is currently 14 years old and will not meet the eligibility threshold until March 2026.
The squad for the T20 World Cup was finalized while he was still legally underage, preventing selectors from including him despite his form.
The BCCI has prioritized his development within the India U19 squad, where he is a key player for the upcoming U19 World Cup in Zimbabwe.
Selectors often weigh runs scored in the domestic "Plate Group" differently than those against top-tier international bowling attacks.
While his IPL century and domestic records are historic, the management prefers he gains more experience before debuting for the senior national side.