Can rent be claimed in Manitoba if it was paid for 5 months on shared accommodations? What if I don't know the tax roll number?

The Income Tax Act of Manitoba allows only one education property tax credit per residence. If you shared accommodation with one or more individuals, only one of you can claim an education property tax credit for that residence for the time you were sharing.

You can search for the tax roll number here: https://web22.gov.mb.ca/mao/public/search_select.aspx