You may be eligible to claim home office expenses on your 2020 return as your employer (in line with the rules) is requiring you to work from home. Hopefully for not more than a couple months but while in effect this deduction is available.

In order to claim this deduction, you will need:

1. Form T2200 Declaration of Conditions of Employment completed and signed by your employer

2. A summary of related costs you paid for that were not reimbursed for the work from home period. You can deduct the part of your costs that relates to your work space, such as the cost of electricity, heating, and maintenance. However, you cannot deduct mortgage interest, property taxes, home insurance, or capital cost allowance.

3. Percentage of work-space-in-the-home i.e. area of the work space divided by the total finished area

Source: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses/line-229-other-employment-expenses/salaried-employees/work-space-home-expenses.html