I found switching users from the preferences in the edit menu fixed similar for me.
Select Deactivate Muse from the Help menu. Check the box in the dialog. Hit the Quit button. Relaunch and Muse will ask for your Adobe ID again. Once you login Muse will be reactivated and Publish will work again.
Sorry for the inconvenience.
Nope, that didn't fix it. In fact, after deactivating, relaunching and trying to login, I get the message "An unexpected error occurred processing your requext. Please try again."
So I have been trying again on and off for the past six hours, with the same result. The login ID is good, because I am logged into both the Adobe forums and Adobe.com.
Maybe I should uninstall Muse completely and reinstall. Or maybe there are some Muse preferences I should delete.
have you tried creating a new trial site?
Did not yet try a new login ID. Fortunately I didn't have to. After unstalling and reinstalling did not solve the issue, I finally uninstalled again and deleted whatever preference files I could find.and closed down for the night. Then this morning I tried reinstalling again and my regular ID was accepted. This also allowed me to publish successfully.
The next step is to try to manage my site and see where that leads, but I have done only a bare-bones site so far and am wondering at what step in the process the site gets "locked" so changes are no longer possible.