It is not going to work. (This question comes on the forum like once a week.)
The emails are coming in too fast.
Read Outlook Known Issues and Limitations from Microsoft.
The Outlook Connector isn't always instant and can take a few minutes to trigger, or up to an hour. Then it could be that it is happening too fast. Especially if the flow is trying to download attachments.
Setting Include Attachments to Yes causes the connector to wait for all attachments to be downloaded. When many emails with attachments arrive around the same time, the connector can timeout while downloading these attachments.
To avoid this, the trigger should be changed to set Include Attachments to No, and the logic should be changed to add the Get Attachment (V2) action to download the attachment.
Additionally, LogicApps authors should ensure that the Office 365 mailbox and the LogicApp are hosted in the same region to reduce attachment download time.
The first thing you can try is to change your flow so that it uses the 2 steps as recommended. 1. When a new Email Arrives 2. Get attachments. By separating this into two steps it allows the attachment to download into the email box.
I think that you will need to adjust how you approach this. You are trying to use email as a data transfer method which is ok in small quantities, but at larger scale you will have issues. Especially with this happening at same time constantly.
Maybe try to think about new processes like -
Change Flow - Every 45 minutes pull outlook email folder and attachments.
Change Report Quantity - Does every report have to be hourly or 30 minutes? Can some be daily?
Change Source Connection - can the source download to a folder instead of email? Can you connect to the source with power automate or something like SQL Server or Dataverse?
The process will have to change to relieve some pressure on the trigger. Even a solid trigger like "When a New Item is Created" in SharePoint would have issues if it got hammered 100's of times in a short period of time. Adding file attachment data as well as Outlook inbox limits will be even more susceptible to problems.
Wish I had an easy button answer, but I think the system limitations will require a change of approach or expectations to get your desired results.
Other Posts with the same thing:
Outlook Flow Triggering Too Slow
Outlook Trigger Slow Performance
Not All Email Attachments are Saved In OneDrive
