Won’t send from alias

I’m trying to set up this plugin to send email from an alias I have on my gsuite account ([email protected]).

I’ve properly set up oauth on my google dev account and on the General tab of the plugin, it shows that it’s connected.

When I send myself a test email, it goes to the correct details I specified in the “from name” and “from email address” fields, but when I put through a test purchase of a product through woocommerce on the site, the email goes with the correct from name, but the email address reverts back to my main G Suite address (The one I entered in the “OAuth Email Address” field). How do I fix this?