Google Voice / Hangout : blocked microphone error

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Problem :
Can't make a Google Voice call as mic is blocked (or hangout call, as it seems to be known now)

Get this error :

"Hangouts needs access to your microphone to make calls. Click the blocked media icon at the top of your browser."

If you can't see the icon, the pop up may be blocked by your browser (probably Chrome)

Answer :

Check the address bar to see if the pop-up is blocked  (see picture)