Lambda Trigger Disappears

I am creating a lambda function tiggerred by cloudfront. I am folling this tutorial (https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-edge-how-it-works-tutorial.html). My function tests without error, but when I attemtp to verify it, it appears not to be called. When I leave the lambda page and then return to lambda and click on my function, the deploy dialog re-appears as if I had not deployed the function (even though I have previously deployed it). If I log out of aws and log back in, there is no trigger listed for my function. I have re-created the trigger several times. I've also deleted the function's replicates and created a new function with a new name. The trigger still disappears.

I have read other posts that suggest incorrect permissions on the function can cause this problem. The tutorial instructs me to choose the Basic Lambda@Edge policy template. I assume this template adds all the permission I need.

How can I add a trigger that does not disappear?

Thanks