Cannot connect Analytics Account

Hi,

I created a new Google Analytics account yesterday.
Today I have installed the MonsterInsights plugin on the website and followed the very easy directions to connect to the Analytics account.

It fails and tells me “Invalid UA code” even though I followed the process correctly. I have tried multiple times.

Anyone have any info on why this would be happening? The only thing I can see that is different is that when I get to the Pick a Profile page and I choose my account there is no “I am not a robot” box for me to tick before hitting the green ‘complete authentication’ button. But don’t see why that would give me an “Invalid UA code” error.