If you worked at an established office in TN even though paid by a NY based company then the income is not NY sourced and you would prorate. 92% would be the NY percentage (11/12).
However if you worked from home in TN because of employer necessity (Covid-related, for example) then the income is still NY sourced and you do not need to prorate.
You may need to clarify a bit on the description box question. I don't see that when I allocate in the NY state return.
TN does not tax wages so you don't need to file for that income in TN if you prorate.
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