Send email to external users (having non microsoft.com in email) from an azure logic APP's office 365 connector with sender having microsoft.com email

Question

I have a Logic App that is responsible for sending email invitations when a new user is onboarded to the Microsoft Partner Connect portal. The app is configured to send emails to both internal (e.g., *@microsoft.com) and external users (e.g., ******@costco.com). This functionality was working fine earlier. However, for the past few months, emails to external users are no longer being delivered, while emails to internal users continue to work as expected. It appears that recent Microsoft email policy changes may require some kind of consent or additional configuration for sending emails to external domains. I'm unsure about the exact requirements or approval process to get this working again. Currently I am using office 365 connector logic app action and signed in with a microsoft.com email. But when I used outlook connector to send email and signed in with my gmail id it worked. Means outllook connector was allowing me to login with gmail id and email delivered to external user. But that's not my requirement here - I need to send email through that MS email id (invitations@microsoft.com)