Hi @Dan Klobnak ,
Welcome to Microsoft Q&A!
I detailed read your post and I am trying to understand your issue like below, please feel free to let me know if I have any misunderstanding:
- You created a Inbox forward rule(forward to User B) in Use A's Outlook
- When User B send emails to User A, User B will not receive the forwarded email.
- When Other users(like User C) send emails to User A, User B will receive the forwarded email.
If this is your case, I'm afraid that it is quite normal and is by design. I understand that this rule might usually be used when user A is Out Of Office and need to back up his work to User B, which could help avoid duplicate or unnecessary email messages in one mailbox. I did the same tests in different mailbox(Shared mailbox and User mailbox), all of them seems have the same behavior and there is no options to change that.
As a workaround to your situation, I would suggest you to create desktop client rule in the User B's mailbox like moving a copy of the sent emails with "failed" in the message body to the "Inbox" folder.
Hope this can be helpful.
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