Reply-to header address being ignored on Outlook for Android app

Steps to recreate:

- In Outlook 365, click New Email
- In Options, click Direct Replies To
- Under Delivery options ensure Have replies sent to is ticked, and click Select Names
- Select a mailbox / email address that is different to the one from which you are sending the email, double-clicking it to ensure it is added to the Reply To box
- Click OK
- Click Close
- In the 'To' field enter the email address for which you have Outlook for Android setup on your phone - in my case email address removed for privacy reasons
- Complete the Subject and Body as normal and click Send
- Within your Outlook for Android app open the received email and click Reply

Expected Behaviour
- The 'To' field of the email should have both the email address from which the email was received AND the email address of the mailbox you configured the message to also direct replies to.

Actual Behaviour
- The 'To' field ONLY contains the email address from which the email was received

Comment
- The same activity exhibits the Expected Behaviour when using Outlook.com
- The same activity exhibits the Expected Behaviour when using Outlook 365