wpt17.12 not working with public agent

I download webpagetest_17.12 today.

After installation I get, “Error submitting url for testing” when trying to test google.com via public agent.

Here is my locations.ini

[locations]
1=Dulles
default=Dulles

[Dulles]
1=WPT_Dulles
label=Dulles
group=WebPageTest Public

[WPT_Dulles]
browser=Chrome, Firefox
label=Dulles
relayServer=https://www.webpagetest.org/
relayKey=A.12345… (I do have the actual API key)
relayLocation=ec2-us-east-1

Any help would really appreciate.

-sam