SharePoint/Power Automate Issue

I am the IT Manager for a small business. I was told that SharePoint can be used as a ticketing system, if set up properly. I have actually gotten it to work, but here is the issue. We have 2 email domains, one is MSI and the other is @asc*. When I send an email to the latter, it works but if I send it from an msi email, it does not work at all. Is there a setting or something someone can point me to or do I somehow have to make 2 different flows in order to get this to work. Any help is appreciated

Don Murray