How to accept apple music invitation?

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Here is your answer
Sign in to your Apple ID and open Safari on your iPhone iPad or Mac.
Go to Music. Apple.com account and sign in with your Apple ID.
At the bottom of the page tap your name and select "View My Account" to open your account settings.
In your account settings under the Manage tab tap "Media and Purchases".
Next to Apple Music tap Manage.
Next to Apple Music Family tap Share.
Enter the email address of the person you'd like to share your subscription with and tap Send.

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