Hello @Simon_BRAMI1,
Well, it took a while to fully investigate this one. First, I want to thank you for your feedback. 
We detected an issue in our fixed IP (used for whitelisting) functionality thanks to you.
For now, we decided to remove the MSSQL Cloud onboarding since the issue cannot be tackled right away.
We will investigate more time in the future to reenable it for the cloud onboarding.
We will update you when the situation comes back to normal. Let me know if you have additional information.
Kind regards,
Morgan