@StardustOne Download the new version of |TPlink from the website.

@MrsB middle (house icon) light tells you how it is connecting to another powerline adapter in the powerline network (the one through the mains cabling). If you only have one plugged in there can be...

You should see both adapters on the one screen. If you connect in the garage and can see the garage unit then that is working. If you connect on the office side and see the office unit, then that is...

You have 2 powerline boxes. I would plug each into a power socket that are close to each other, to save you walking all over. Although the manual says do not use a multiblock extension I find you can...