Currently, it is not possible to send surveys to email addresses containing special characters (e.g., a "+") via the Customer Voice Action in Power Automate Flows. However, this is possible with the Outlook Connector. This functionality should also be implemented for the Customer Voice Action. One of our clients frequently encounters the situation where their customers provide email addresses with a "+". This "+" symbol in email addresses is a feature offered by email providers that allows users to extend their email addresses, helping them better sort/organize their inbox.

We have implemented a workaround that converts the "+" in the email address to "%2B" within the flow, enabling the Customer Voice Action to send the survey. However, I believe it is necessary to enable the ability to send surveys to email addresses with special characters, as the Outlook Connector already does.