Windows 10 activation issue

When I updated my Windows 8 to the technical preview it was not automatically activated as described in the Microsoft documentation. 

The following process will take care of the activation issue on in-place updated Windows 10 installations:

1. Open Administrative command prompt

2. Type: SLUI 3

3. Enter the product key Microsoft provided for recovery scenarios: PBHCJ-Q2NYD-2PX34-T2TD6-233PK

This will get rid of the Activation Message (at least until April of 2015)