The global Enhance email address under branding is just for branding and CP password reset emails.
I may be wrong, but I think you will have to install WP SMTP Plugin on your WordPress website and then setup/force there the FROM address you want. You must turn ON the Return Path option to be equal to the FROM so the email is sent properly.
I think that by default all WordPress websites send emails using "website_linux_user@$server_hostname" and that causes delivery issues due to fail SPF, DKIM and DMARC.
In my case using just WordPress without any SMTP plugin causes all WordPress emails to be sent using FROM "website_linux_user@$server_hostname"
