Same problem, after login to my account the editing link "https :// www. tesla. com/ teslaaccount/edit-design/RNXXXXXXXXX" is not working.
Note: There is a $4,000 drop from my order 3 months ago:
$ 2,000 .......... Pearl White Multi-Coat
$ 3,000 ........... Autopilot
$ 5,000 ........... Full Self-Driving Capability
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$10,000 .......... May 2019
Included .......... Pearl White Multi-Coat
Included ........... Autopilot
$ 6,000 ........... Full Self-Driving Capability
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$ 6,000 .......... August 2019
Should I make a new reservation to take advantage of the current $6,000 which might change to $7,000 August 16?
One issue anyway is to get the Towing option, which is not (yet) listed and one of the reasons for replacing my Model 3 with a Model Y