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Hi Philip,During the APNS renewal steps, you need to make sure you login to the Apple push portal using the "Associated Apple ID" listed on your maas360 portal at > Setup > Services > Mobile Device ManagementThat is the first thing. Next, the topic change error suggests that perhaps the wrong certificate was renewed. To confirm you are renewing the correct certificate for your maas360 iOS devices, you need to check the "APNs Certificate Topic" on your maas360 portal, also found at Setup > Services > Mobile Device Management.This corresponds to the Subject DN UID of your certificate when your logged into Apple's push portal and the two need to match.I'd advise to try the renewal again once more. If there's more than one certificate listed on the Apple site, click on the little "i" next to each token and check the Subject DN to ensure you are looking at the correct token. Once you've verified the token is correct, proceed with the renewal steps.
I've added documentation for doing this procedure below :https://www.ibm.com/support/pages/apple-mdm-profile-renewal-troubleshootingI hope this helps.
DavidIBM MaaS360 Security Support Engineer