Don't panic, this is normal
You searched your major on ASSIST, hit enter, and got nothing. Take a breath. This happens constantly and it almost never means you can't transfer. It means one of three things, and all three are fixable.
Here's why it's missing
One, the school calls your major something else. "Business" might be listed as "Business Administration." Try a few name variations before you assume the worst.
Two, the agreement just isn't posted yet. ASSIST builds these one school and one major at a time, and some just aren't up yet. The major exists. The page doesn't.
Three, the major is closed to transfers at that campus. This is the only real "blocked" case, and it's actually good to find out now instead of two years in.
If that's already feeling like a lot, you can just use a website like Pipeline, which will literally make your schedule for you so you don't have to deal with ASSIST at all. Or if you want to figure it out yourself, here's how.
What to actually do
Check the same major at other schools. If UCLA isn't listed but UC Irvine is, that page shows you the kind of prep classes UCs usually want for your major. Not a perfect match, but a strong start.
Go straight to the major's department page on the university's website. The department usually posts what it wants from transfers, even when ASSIST hasn't caught up. This is often your most accurate source.
Keep taking your general ed classes in the meantime. Those don't depend on ASSIST at all, so there's no reason to stall while you sort out the rest.
Then take what you found to a counselor and have them confirm it. They deal with missing majors all the time.
The shortcut
Hunting your classes down across a bunch of different websites is the reason a lot of students take 3 or 4 years to transfer instead of 2. Whether you use Pipeline or do it by hand, the move is the same: figure out the exact classes before you enroll, not after.
Bottom line
A missing major is a speed bump, not a dead end. Check the name, check other schools, hit the department page, and keep your other classes moving. Do that and you'll have a real plan even when ASSIST gives you nothing.
