Google maps iframe zooming is not work

i have a problem with Google maps iframe on my website when i use iframe form Google maps website and put zoom not work

iframe src="https://mapsengine.google.com/map/embed?mid=zCqArMwLBI1M.kOBWLJlkdlWY&zoom=21" width="640" height="250"></iframe>

can any one help me thanks

Solution

Use z= instead of zoom=

<iframe src="https://mapsengine.google.com/map/embed?mid=zCqArMwLBI1M.kOBWLJlkdlWY&z=15" width="640" height="250"></iframe>

The zoom level must be (1-20)

DEMO

Edit - 22nd April 2017

As per Connor William's comment

Google has updated its API use ZOOM instead Z=