If you change your sub-domain, there is a chance that you might get duplicate subscribers. As a result of this, whenever you send a notification, users start receiving it multiple times. This increases the probability of a user unsubscribing from receiving notifications.

So, the sub-domain is a fixed entity.

Also, read:
5 Reasons Why Your Business Needs Push Notifications
Will integrating Truepush impact my page load time?

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Website: www.truepush.com
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