Couldn't hurt to try resetting or changing the password at Hulu and try again with the new one.
A couple articles from the HELP site
https://help.hulu.com/article/hulu-cant-login
https://help.hulu.com/article/hulu-manage-devices
To log out of all computers:
- Go to your Account page and log in if prompted
- Look for the Your Account section. Under Privacy and Settings, select Protect Your Account
- On the next pop-up screen, click Log Out Of All Computers to log out all web browsers except the one that you’re currently using
