@HouMez Thank you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
This is caused by Office 365 connector does not support “item attachment”. From our official document, we should use HTTP with Azure AD connector to work around such limitation.
For your reference you can refer to this blog post on how to implement the logic app to send .msg
or .eml
as an attachment using HTTP connector.
Feel free to reach back to me if you have any further