Why I need to add URL prefix on HTTPS website URL (only on some browers) [closed]

I am currently using MAMP on a PC (windows 10), and using Apache as server to publish a website.This website use https protocole : https://mydomain-website.fr

On some computers, I could reach website with this URL https://mydomain-website.fr, for others I need to add www prefix at the domain name (https://www.mydomain-website.fr.

Do you know why ?

Thanks for helping.

Best regards