Maintenance doesn’t works

Hi,

I have enable the plugin but it seems doesn’t works.

It works in preview mode : https://lesportingcom.wpcomstaging.com/?maintenance-preview

I heard about issue with cache plugins. I don’t know if there is one by default in wordpress?

Thanks for you help,
Thomas.

PS: Sorry for my english, I’m french and I try to do my best. ??

The page I need help with: [log in to see the link]