So you have your Advanced Call Forward feature configured correctly, but the test call says otherwise.
Here is how it should look:
It should have your Home Phone number and the Nomorobo Number listed.
If the test call still isn't giving you a positive result, and your Advanced Call Forward feature matches the image above exactly, then you need to contact Comcast.
There's a glitch in Comcast's site, that's causing the Advanced Call Forward feature to not forward the call correctly.
To get this fixed, you are going to need to contact Comcast. Specifically ask for their Advanced Technical Support, and explain to them that the Advanced Call Forward feature for your line isn't working properly. Ask them to manually reset the entire feature. They should be able to do this for you.
Then, try the set up again.