Office 365 Internal Relay

I have set up an internal SMTP Virtual Server relay in IIS that I want to use to relay LOB App messages to Office 365.

I am able to use it, but ONLY if the sender of the message matched the address placed in the Outbound Security > Basic Authentication field.

How can I make this work so that I any valid LOB App sender (with a valid O365 mailbox) can send through it, I just want to limit it to IP addresses later for security.

Thanks in advance.
Christian HansAsked:
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