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As per IOS recommendations, We have changed the APN process from legacy binary protocol to Apple’s HTTP/2 notification. We are using PHP to send push notifications. After the change management, We are seeing an increase in the failures. While validating the data We found that the Device token has the length 78 chars are returning success and Device token with 50 length are returning "Bad Device Token (400) error".
Please check and share to help us to identify the issue.
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