Please note you will need a verified Apple ID in order to sign in to the app. If you do not have a valid Apple ID set up on your phone, please do this first before following the steps below. 

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Step 1:  Make sure you have legit & accessible email addresses for your Apple ID
(Open Settings on your iPhone > click your Name/Apple ID at the top of the page > click Name, Phone Numbers, Email > check your email addresses under 'Reachable At' and 'Hide My Email')

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Step 2: Make sure you have two-factor authentication turned on
(Open Settings on your iPhone > click your Name/Apple ID at the top of the page > click Password & Security > Turn on Two-Factor Authentication if it's not already on)

Step 3: Make sure your Apple ID has been verified

(You can verify your Apple ID email address here: https://developer.apple.com/register/error/apple-id/)

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Step 4: Make sure you have a passcode set on your Apple Watch

(Open Settings on your Apple Watch > click Passcode > set a passcode - you will only need to enter this once a day, not every time you use your watch)

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*If all else fails, please make sure you are up-to-date with the latest iOS and WatchOS versions.