It probably is a legitimate email.
TurboTax HAS had a problem with depreciable assets not transferring to the 2020 tax return for Schedule E that they are just fixing now.
See these two posts about it (one is for people who have already filed, the other is for people who have not yet filed).
https://ttlc.intuit.com/community/asset-depreciation/help/how-do-i-fix-my-rental-properties-and-roya...
https://ttlc.intuit.com/community/asset-depreciation/help/how-do-i-fix-my-rental-properties-and-roya...
