WordPress unavailable for scheduled maintenance error is common and should not worry you since it is a normal error that indicates that the WordPress is updating or there is an interruption in the process of update.
In this case, the site is put on the maintenance mode, and if you try to interrupt the update, this error may occur. The persistence of this error can result in administration pages denied access as well as the frontend. You can learn more about this WordPress error from the video tutorial
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