FortiGate 60D - FortiCloud internal error

Hello, I have a problem logging into my FortiCloud account on a FortiGate 60D firewall. When I try to log in through the GUI I get this error message "FortiCloud internal error". And when I try with the CLI I have this one "Failed: FGT internal error(-1). Command fail. Return code 5". I just logged into my FortiCloud account on more than 30 other fw (60D) and had almost no problem. Any advice ?

Thanks !