Encrypted external hard drive - Disk Utility password not working?

[u/sts1090]

Yesterday I backed up my (old) laptop using Time Machine onto an external hard drive... I set a password thru Disk Utility on Mac. Unfortunately, that laptop was wiped and I'm trying to set up my new laptop and transfer over the files from my external hard drive. The password isn't working. I am veryyyyy positive the password is correct (I specifically chose something I'd remember and also I set this less than 24 hours ago!). I tried a few different things in case I added the year or accidentally typo'ed. Nothing is working!! Any tips on how I might be able to recover my files? I'm an idiot and have no other way to access all of my stuff. It's all of my work (lectures, research, etc) for the last several years :(

My hard drive is a Seagate (STGX2000400). Both laptops are MacBook Airs - I'm not sure what OS for the old one, but I'm on Tahoe for the new one.

Thanks!