I have a flow that will trigger when I test it on my own account and will trigger when I send the user an email from my account to her, but it will not trigger when she receives the email from the user it needs to trigger for (the time when we actually need it to trigger). The flow in question:

- Checks my users inbox for emails from a particular person and for a certain subject (the subject is static/never changes).

- If the email is found, a condition runs to filter out images titled 'image00'. This is to strip out signature block images.

- Any remaining attachments are stored in SharePoint

I first tested this flow by sending emails from a generic email account to myself. Flow worked great. Next, I got a copy of the exact email that needs to be filtered with the attachments and sent that from the generic email account to me. Again, flow works great and the attachments saved to SharePoint. Finally, I set up the flow for the user and sent the email (the email that is exactly what we need to filter) from my generic account to her and watched the flow work. The only time the flow does NOT work is when the email comes from the person it needs to be triggering for.

The only difference I've found between the emails they send vs the ones Ive tested with are that they include many more people (30 recipients), but Im not sure if that could cause issues with the flow. Ive also checked and there are no rules that are running against these emails that would cause it to miss the inbox thus negating the flow triggering based on it arriving there.

Any help would be great as Im about out of ideas.