If you post a lot of temp web sites on Adobe businesscatalyst like I do then you may run into this error when you try to publish from Muse... As the error indicates there is indeed a limit to the amount of sites you can have on your account
link = Managing your client sites
Workaround;
Sign in to one of your temp sites that you no longer need, using whatever browser you have i.e, goto the home page of the site and replace the /index.html with /admin then delete the site... Be sure to leave feedback for Adobe about why
Now you can go ahead and publish another temp site from Muse to replace the one you removed
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