The error message is directing to a mismatch of user name or password information saved in system than what you have entered to login. Make sure, that all the details must be entered carefully. There are few reasons, why this could be happening.
1. Email address and password are case sensitive. Type username or email ID cautiously.
2. Be precise to fill “https://yourdomain.atlassian.net” in domain field. Typing out atlassian.com will give “Invalid Jira Account” error, even though you’ve provided valid username and password.