Hello,MattiaBuccheri
Thank you for posting in the Microsoft community.
If you have set up Bitlocker to be uploaded to your Microsoft account, you will be able to see your recovery key under the corresponding device on account.microsoft.com, and then you can access the SSD to back up your data.
If you don't find the Bitlocker recovery key, it will be very difficult to retrieve the data, and you will have to convert the drive to NTFS format by using a third-party software and reinstall the system.
I wish you all the best and please feel free to contact me if you have any questions, I look forward to hearing from you which will determine where we go next!
Best Regards,
Rota Ye |Microsoft Community Support Specialist