Hi there,
I've searched the community but haven't found a solution that works.
I have a button in my PowerApp that triggers a flow to send an email from a shared mailbox. I've used the "Send an email from a shared mailbox (V2)" action (see below). I (and the other two flow owners) have permissions to send from this shared mailbox and are owners of the flow.

When one of us shared mailbox owners trigger the flow in the PowerApp, it sends (fine). BUT, when anyone else triggers the flow in the PowerApp, it throws a '404 - Specified folder not found' error (see below).

I have tried changing the action to "Send an email (V2)" and adding the shared mailbox to the 'From (send as)" section, but when someone who doesn't have access to the shared mailbox triggers the flow in the PowerApp, it throws a '403 - You are not authorized to send mail on behalf of the specified sending account' error (see below).

How can I construct my flow so that emails are sent from a shared mailbox, when triggered in a PowerApp by someone who does not have access to the shared mailbox?
Any and all advice would be greatly appreciated, this has stumped me, thanks.
Thanks,
Carla