When college students are stuck at home and away from their friends the last thing on their minds is going to vote. Young people are pack animals and when they are isolated from the pack they do not have much initiative.
After this election there will be be a lot of griping and recriminations about the blue state lockdowns among the far left.
Professors would also encourage students to vote with incentives but getting an absentee ballot from your home state requires planning and scheduling. Students don’t care enough to vote and their lazy lockdown routine is pretty set.