Can’t connect to the dashboard after url change

Hello everyone,

Happy new year !

I think I made a mistake….
I’m a newbie in wordpress. I use it on internet, I did not install it on my computer.
I was using wordpress to create a new version of my website. The old one was made with muse, and hosting with Gandi. Gandi offer the possibility of working with wordpress. So I start created the new website.
Today I delete the old one http://www.aumfilms.eu
In wordpress I was working on the new one with this address aumfilms.eu , without the www .
I make a change today ,after deleting the website in Gandi, in wordpress putting the www .
Now I can’t connect to wordpress to get access to my dashboard…
When I go to this page : https://aumfilms.eu/wp-login.php
Safari says to me : Fail to open the page, can’t connect to the server.

I put the www. in both WordPress Address and Site Address.

I still have an old backup of the website so I put back on the web. So the old address will work.
I write to Gandi support, I will wait to see what they say.

Thanks for your help, I will keep searching in the different topic, but for now I didn’t find what I need.
Have a good day ,

Martin

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