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Please be informed that Auto-Fill does not enter credits only income as seen in this TurboTax FAQ.
What tax slips can I download through the CRA’s Auto-fill My Return service?
We have created a comprehensive guide for information related to the employment expenses, which will guide you through the process of how to include this credit in your return in the TurboTax FAQ link. Employment Expenses Tax Info Centre
Using the flat-rate method
Eligible employees may claim a flat rate of $2 for each day that they worked at home during a consecutive 4-week period, plus any other days they worked from home in 2020 due to COVID-19 (up to a maximum of $400). You don’t need supporting documents to claim this flat rate.
Example:
Between March 16 and December 31 there were 209 weekdays. During that period, there were 6 statutory holidays. The employee took 10 days of vacation and 3 sick days.
Subtract the days not worked from the total weekdays to determine the total days worked from home (209 weekdays − 6 holiday − 10 vacation − 3 sick = 190 days worked from home)
Multiply the total days worked from home by the $2 temporary flat-rate amount (190 days × $2/day = $380 in claimable employment expenses).
If you have any further clarifications, we would be glad to guide you through.