Sending email confirmation isn’t possible straight forward, I found a way to do this with Postmark.
1: You start a workflow on a button and the first action is:
You choose not to send the email but just create a token.
2: Then watch this video to connect Postmark with the API Connector (bubble)
3: After creating the connection, you will have this new option
Add this new action and you will see the next option
Most of the code will be populated from the connection video.
4: the verify-url will be:
https://myapp.bubbleapps.io/version-test/email-confirmation?confirmation_email=“Token from the first step”
Hope this helps