Thanks for all the advice especially Starwood Lurker. I contacted the customer care centre and got this reply within the hour:
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Thank you for your recent message to Starwood Preferred Guest. I welcome this opportunity to assist you.
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Congratulations on your upcoming wedding! On behalf of Sheraton we'd like to wish you all the best.
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I have contacted The Royal Orchid Sheraton Hotel & Towers on your behalf regarding your upcoming stay. Please rest assured that your reservation is active for your arrival. You may not be able to view this online. However, the front desk has ensured that your reservation is active in their system.
So it all looks fine now