Greens keys won't show. SafeGuard Sophos 8.0

There's two things here - PC Laptop has been encrypted I'm guessing means it's using FDE (Full Disk Encryption) - as in BitLocker (as you're using W10 Pro) This is not the same as file encryption.

This is a separate policy and the drive being encrypted (or not encrypted) has no bearing on this. You'll need to check if the policy applied to both PC's is the same - I would suspect not. You can use the RSOP tab within  the console to see what policy/settings are applied to each PC and compare.

The File Encryption will over-lay keys onto icons - so it's this policy (or lack of it) that you need to address, not the FDE policy (BitLocker)

thank you for your reply
for the encryption I used only the encryption of the files and the strategy used was applied on almost 50 PC, only for this pc that I met this problem.

Have you run the RSOP tab on the console; adding the PC name to see what policies are being applied to this rogue machine?

yes 

And the PC AYADI has recently communicated with the server and got these policies?

yes 

Have you checked that the client is configured in the same way on both the working and non-working client?