Sending email via Protonmail

[Brian_Morgan]

Good Morning,

I’ve deployed a simple app to my Android phone. There exists a record that contains an EMAIL field. When I click the icon, my phone offers the choice of two clients: Gmail and Protonmail. Gmail works as expected: it launches and then composes an email with the recipient’s email address. Protonmail launches and composes an email but does not fill in the email address.

Any suggestions on how I can begin debugging this?

Thank you,
Brian