I suppose you may follow this guide to submit a message to Microsoft for analysis:
Manually submit messages to Microsoft for analysis
If you would like phone support, please refer to this link to contact support and see if they are able to help you with the issue:
Global Customer Service phone numbers
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Hi @Nicolas Moreau
Since this is a public forum, I have removed your personal information in the post.
Please don't forget to hide your personal information for security.
Thanks for your understanding.