The only iCloud service the Apple TV uses is photostream. You would need to use photostream (and iCloud) with your office address on other devices, before you could use the office address for photostream on your Apple TV. If you are currently using a different account for iCloud on other devices you will need to log into the account that uses the office address and manually move all your data across.
Would it not be simpler to use the non office address for photostream on the Apple TV.
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