iOS Question iOS push notifications sometimes not delivered — topic vs token reliability?

marcick said:

although reported as successfully sent

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The report you get on the server side means that the request has reached Firebase servers successfully. It doesn't tell you whether the message was actually delivered.

marcick said:

any difference in reliability when sending to a topic instead of directly to a device token?

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I don't see any reason for them to behave differently. Handling tokens is more challenging as they are changed quite often and you need to monitor these changes.