There is an known issue with weemote® X version R13 models where the learning function is not working properly on the Power button.
With this version, you can't learn directly onto the Power button without first entering an embedded code into the unit.
For example if you want to learn the TV Power Signal.
1. Enter any random TV code in to the unit, i.e. code 10 as described on Page 6 of the weemote X Setup Guide.
2. Learn the Power signal from your existing remote to the weemote X as described on Page 6 of the weemote X Reference Guide.
Note that all other buttons can be learned directly without taking this additional step.