What cam are you using?
If for example you are using oscam-emu
Scan the channel then go to oscam webinterface and look in status
You should see the cam searching for the key and will say FF 011234
Copy that info into softcam.key like so FF 011234 00 DAXX81D056C828XX
Here is an easy way to do it:
FF 11FFF 00 DAXX81D056C828XX
What i do for biss keys is keep the 'biss' part empty because enigma 2 gets a mid muddled up when channels have the same sid/pid
Empty your biss channels and try the example i gave you above
Go into 'files' in webinterface then 'other files'>'softcam.key' from the dropdown - edit the key and save
Then go to Restart top right hand corner and restart oscam