Issue Summary

Webhook subscriptions require an email address as well, so we can send notifications if the webhook endpoint has issues. If you create a webhook subscription first, and then try to create an email subscription using the same email address, you will be blocked from creating the email subscription.

Steps to Reproduce

1. On a page with no subscribers, go to the main page and start a Webhook subscription. Note that we ask for an email + webhook URL

1. Force refresh the page to ensure nothing is cached

1. Attempt to sign up for just an Email subscription, using the same email address from step 1

Expected Results

You go through the standard process to setup a new email subscription from scratch

Actual Results

You are brought to a screen that shows the Webhook URL from the subscription setup in Step 1. Not able to successfully create a separate email subscription

Workaround

Email and Webhook subscribers must use unique email adresses