The party says it wants a guarantee from ministers as thousands of young people remain in campus lockdowns.
By Sunday evening, 1.5 million people - almost half of Wales' population - will be locked down.
It comes as the number of new cases in the UK topped 6,000 for the fourth consecutive day.
Police investigating the shooting of Sgt Matiu Ratana say they have CCTV from the custody suite.
The coronavirus pandemic means it is a "particularly difficult time to be young", says Prince Charles.