Do you see the booking on AY but not the fare or is it that you can't get it up at all on AY?
If you can't see it at all on AY, Is is a case of not having the correct ref?
Do you have e-tix #?
Can you add the booking to the app?
Can you get the OTA to add your AY+# to booking (because then AY+ pages usually finds the booking)
If you can see the booking but not the code, get OTA or AY to send you the full fare rules. In there will be fare code.