How do I request that "Australia Post Domestic Letter with Tracking" be added to the list of postage

I list most of my items with FREE POSTAGE (Use own packaging - Aust Post Domestic Regular Letter Untracked). When I try to "Add a second postage service", the option to add "Aust Post Domestic Letter with Tracking" does not show on the list of options available (because it is listed in the "Use Carrier Packaging" list).

How can I have both postage options included on my listings?

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I can add  both. If you have the dimensions try removing them or adding them if you dont.