Why web push notifications not delivered to all subscribers?

Question: Why web push notifications not delivered to all subscribers?

Solution:

    There might be a situation when some of the users do not receive push notifications that you have been sending to them. There is a set of possible reasons for this. You must figure this out.

    Here is the common problem comes with the push notification.

    1. Failure in connecting to GSM: This problem arises when a user not using an internet for a long period of time at a particular mobile phone or system.

    2. Firewall Issues: companies use a firewall for their protection and this is the also reason to block unknown notification from outside.

    3. Blocked at the operating system level

    4. Battery Saver Mode

     

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