Apple Watch Series 3
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Apple Watch Series 3

watchOS 4
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My Apple Watch Series 3 watchOS 4 doesn't register my activity

Cause 1 of 3: Your Apple Watch is too loose on your wrist

If your Apple Watch is too loose on your wrist, some of the watch sensors will not function correctly.

Solution: Adjust the watch strap so that your Apple Watch is neither too loose nor too tight on your wrist.

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