Can’t redeem an Ingress Passcode

Hack plenty of enemy portals. You get 100 AP for hacking an enemy portal, but none for hacking a friendly one.

If there are no unclaimed portals around (highly likely in some locations), find a level 1 enemy portal and start slugging away. You'll want a few dozen XMP bursters at minimum to destroy the portal, but the rewards are high--destroying 8 resonators and planting 8 of your own on a single portal will get you almost a quarter of the way there. Even if you don't manage to capture the whole portal, you'll still have gotten 75 AP for each resonator you destroy.

Deploying portal shields is a good way to get AP that may not be obvious at first. Check every friendly portal you encounter to see if it has a full complement of shields. If it doesn't, deploy as many as you can. You get 150 AP for each one.

As far as I know when you hack a portal there is a certain probability that you get nothing. As well as there is a probability to get a good loot.

My observations:

• Hacking enemy portals has a much higher "no item" probability, my estimates would be around 50%
• Hacking the same portal several times in a row, significantly increases the "no item" probability. I had an opportunity to hack the same portal 5 times within 30 minutes (this by the way causes burn out) 2 days in a row, usually at least 2 of later trying (3-5) did not bring me any items except sometimes a portal key.
• Portal key has a different "acquire" probability than items
• I believe if while hacking you jump out of the portal's reach you also get a "no items" message, but I have to test this to confirm