Both Craftsman units. Keyless has been operational for six+ years. GDO has been operational for 16 hours. Can't get the GDO to recognize the keyless entry.

Attempt four steps as outlined in GDO Owner's manual for using keyless entry, but all keyless entry does is blink. GDO does nothing. GDO has PURPLE "Learn" button and amber "Learn" light.

Tried new battery. Tried holding keyless entry right up to the GDO. Tried holding entry button on the keyless after inputting 4 digits; and while holding the 'Entry' button on the keyless, depressing the "Learn" button on the GDO. No joy. No blinking lights from the GDO.

Are these two units compatible? Where can I go online to see a compatibility chart?

Is there a Rosetta stone for making these two units work?

Car remotes work fine.