I see just a very small difference between the credentials you are putting Muse vs Dreamweaver.
Please see the user id - in Dreamweaver the first letter is in upper case whereas in Muse it is lower case.
Do make this correction in Muse and see if it gets connected?
Incredible! I did not know that userids were capital-sensitive. Thanks!
Glad that it helped, and yes, user id's are also case sensitive and generally they are preferred to be in lower cases especially for web projects.