This is the information on the ON-BEN form from the government: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5006-tg/5006-tg-24e.pdf. Please note that when completing a joint return, only 1 person can claim the Trillium Benefit. We apologize that your experience with our phone support team was less than optimal.
There is no error on the TurboTax side; I hope this clarified things.
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