You need to claim it.
On the page where you ordered it from under Features you can read under Google Pixel 6a GWP T&C's (not obvious that it's "Google Watch Promotion" admittedly):
Buy a Google Pixel 6a, Google Pixel 7 or Google Pixel 7 Pro smartphone between 6th December 2022 (00:01 – BST) and 29th December 2022 (23:59 – BST) and receive a Fitbit Versa 4 (Black Graphite Aluminium only, subject to availability). To redeem this offer visit promo-rewards.com/smartwatch for full terms and conditions. Participants must be 18 or older and have a delivery address in the United Kingdom. Max 2 per household. Max 8 per business. Employees of participating retailers are not eligible to take part.
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