Error 503

Hello @comolasperasalosperos,
Here you can find more info regarding this error and how to fix it – https://www.wpoven.com/blog/http-error-503/

Hope this helps ??

Hello @comolasperasalosperos,
I had a discussion with my colleague and here is what I can add:

This is actually fine that you are receiving a 503 (service unavailable) when the plugin is active, you simply tell (Google, Bing, Facebook) that your site is temporary in maintenance mode.

You have two ways here:
1. Deactivate the WP Maintenance Mode plugin, add/share your site/link on Facebook and after this activate the plugin back.

2. A more advanced way – change the status code to 200 by using this hook – wpmm_status_code – https://github.com/WP-Maintenance-Mode/Snippet-Library/blob/master/change-http-status-code.php

Let us know if this helps.