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Dear Le Antoine,
Thank you for reaching out to the Microsoft community. We are delighted to offer our assistance.
Based on our test, the link did open a previous version of the file:
If you are still not able to open a previous version of the files with copied links, we are afraid that in order to address this issue, it may be necessary to investigate the environment on your end. As forum support, we do not have sufficient permissions and resources to perform an investigation directly. Therefore, we sincerely recommend that you contact your Microsoft 365 administrator and follow the steps outlined in this article to create a support ticket and contact Online Support.
The support team at Online Support has higher permissions than us and can remotely examine the situation on your end, gather more resources, and assist you with troubleshooting. This will be a more efficient way to address your concerns.
Thank you for your understanding and cooperation! Have a great day.
Sincerely,
Sean | Microsoft Community Moderator