Three codes could be found in the INTO THE #MINDPALACE post on the Investigate Ingress blog.
[1] powxneassapowvjzne
[2] 6zkt6tivvmd3s4j
[3] 4dz33uu5evlove
Code #1
Observations
You’ll need to complete the keyword to get the passcode
Code #2
Observations
A known method but only on certain parts this time
Code #3
Observations
This one is a different format, look at it differently