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Hi,
The Maintenance plugin is intended to display a maintenance page to all users when you are performing maintenance on your website and blocks access to all pages except wp-login.php so that certain users working on the website can still login.
Because of this no other plugins are loaded when the maintenance page is displayed, that includes WooCommerce. So when Maintenance mode is enabled and a user opens a page such as /my-account/ that URL no longer loads the WooCommerce my account page, but just displays the Maintenance page.
In the PRO version you can whitelist other pages so that they are loaded normally even for non-logged in users.