Need some help with App Store after upgrading to Sierra 10.12.6

Hey All -

Just updated from El Capitan to Sierra 10.12.6 and I'm experiencing a login issue with the App Store. I can log into iCloud, but I cannot login to the AppStore or iMessage.

I've tried * Removing all network interfaces, removing all preference files. Re-adding and confirming that Ethernet is on en0 and wifi is on en1 * Updating SMBIOS through Clover by generating new serial numbers * I also went through An iDiot's Guide To iMessage

AppStore gives me the following error: An unexpected error occurred while signing in. Your device or computer could not be verified. Contact support for assistance.​

Really stuck here, any help/pointers would be appreciated.

Computer specs if it helps: * Intel Core i7-2600K Processor 3.4GHz 8 MB Cache Socket LGA1155 (Sandy Bridge) * Gigabyte LGA 1155 Intel Z68 Motherboard GA-Z68MX-UD2H-B3 * XFX ATI Radeon HD6870 1 GB - HD687AZNFC * Corsair Vengeance Blu 16 GB PC3-12800 160mHz DDR3

submitted by /u/brendo234
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