I have the im508s with XP200 programmer.  Adding a new key fob with same fcc id and 315 MHz frequency on both keyfob.  (Read key info and unlocked status with no issue on unlocked OEM keyfob).  Also I can read the passcode from the working key fob when starting the learning process, however it shows (Frequency: UNKNOWN) on screen right after reading info from the working key.  Then the scanner says to place the new key fob on the sensor area and while doing that step, I get key learning failed.

Any help would be greatly appreciated!