Unfortunately, Outlook won't always follow the indentation rules set, due to how Word reads HTML. While our devs are trying to work with Outlook's devs on this, the only real workaround for this would be to take a screencap of the list as it's supposed to look, and replace the typed out list with that image.
For more info on common display issues in different email programs, such as with text formatting or images, I'd recommend taking a look at this post.
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Thank you for taking the time to post in the Community. We haven't heard back from you so we are going to close this idea. This doesn't mean that we aren't listening to your feedback! If you would like to continue the conversation, please feel free to reply here in the Community or vote on any of the other open ideas to let us know what you would like to see.
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