When that statement 'timely filed, original return...' is used it does mean that you cannot file an amended return to claim it.
If you could claim it, TurboTax would use the number of months of use as part of the calculation so that you would only be claiming it for two months.
However, since you did not claim the home office at all and filing an amended return is to add a home office, not change the method, it would not hurt to file the amended return to see if it is accepted.
@4MyInfo
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