The reason you may be receiving the message “invalid credentials” is because your computer is remembering old or different passwords/usernames from other sites even if the correct password/username is typed.
Try clearing your cache, using an incognito browser, using a different browser/computer or clearing your browser history.
Visit the DORMS Guide for more information about using DORMS and troubleshooting technical issues like this one.
If you still need assistance, submit a request to the Disney Programs team here.