TF_E_LOCKED

Code: 0x80040500 (2147747072)

As HRESULT:

S: 1 (Failure)
C: 0 (Microsoft-defined)
N: 0 (Not an NTSTATUS value)
Facility: 0x004 (FACILITY_ITF: COM/OLE Interface management)
Code: 0x0500 (1280)

As NTSTATUS:

Sev: 2 (STATUS_SEVERITY_WARNING)
C: 0 (Microsoft-defined)
Facility: 0x004 (FACILITY_IO_ERROR_CODE: Input/Output)
Code: 0x0500 (1280)

Documented in Win32

Manager Return Values (msctf.h): 0x80040500

The context is already locked.