From the previous thread, it looks like your APNS Bundle Identifier is wrong. You have something like com.symantec.mdm.enrollment.
It should be com.apple.mgmt.* where * can be whatever. For example, com.apple.mgmt.mike-mms.prod and com.apple.mgmt.mike-mms.test would be valid APNS bundle identifier. You will need to recreate the APNS certificate at developer.apple.com to use this format, and then update all APNS settings and steps that you followed previously -- importing the certificate, copying the thumbprint, subject, and so forth.
Does this help?