Could you share more details on your scenario?
Do you want to send out a report every week? If yes, please try to use the trigger Recurrence.
Please get more details on Recurrence at here:
What do you want to report from Office 365? You may try to get events, contacts, emails, etc. then send out an email with the details of the events/contacts/emails. The following doc for your reference:
Please try it on your side and feel free post back if you need more help.
I don't really understand what "Flow" has to do with this, but maybe check out this link and see if one of these reports will give you what you need.
Check out the new Process Advisor community forum board!
Check out new user group experience and if you are a leader please create your group
Participate in the Power Virtual Agents Community Challenge
Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.