FortiClient uninstalls itself.

Hello I am writing here with a hope that maybe some of you will know what is happening. Configuration: 1. One office network. 2. FortiGate runs as ... gate, connected to Active Directory so it knows all users and machines. 3. Active Directory set up - same configuration and privileges for every user (checked milion times). Further this Active Directory is connected with SharePoint. 4. Around 20 laptops with Windows 10, on every laptop FortiClient, on all of them runs perfectly. 5. I have problem with one machine and FortiClient on it. Whenever I connect laptop to Active Directory just like every other laptop is connected, after first reboot FortiClient removes itself from that machine. I tried:

1. Careful check on privileges and set up on Active Directory - both : users and machines. 2. Check configuration of FortGate ... hoping that something there was changed. 3. Remaking user and reconnecting machine on Active Directory. 4. Reinstalling operating system as suspicion for some virus.

5. Making the same configuration on another laptop.

6. Log-in as different AD user on that laptop and installing FortiClient again.

Status:

Nothing from list above helped. As long as I do not connect laptop to Active Directory FortiClient works fine and do not auto uninstall. When first migration to Active Directory is done, then after reboot FortiClient is gone. Potential reason ?: Only one potential answer in my head is that, FortiGate gets information about new user and machine with FortiClient onboard, then it request to auto remove FortiClient, maaaaybe do to some licence restrictions??? Maybe you have any idea on this... Thank you in advance for every tip.