T-Mobile HTC U11 Life S-OFF not working

1. Checking phone connectivity...
Phone connection confirmed!
HTC KEY CARD VERSION: 7
2. Checking Server connectivity...
Server connection confirmed!
3. Checking PowerAdapter connectivity...
PowerAdapter connected, processing request to adapter...
Process started
Starting operation...
Sending oem writesecureflag 0
... (bootloader) HTC KEY CARD VERSION: 7
FAILPERMISSION DENY (DENY)
FAILED (remote: PERMISSION DENY (DENY))
Execution time is 0(ms)
Operation completed!
Releasing adapter.
Request completed