This is from the IRS
. A nonresident alien in 2020 is not eligible for the payment. A person who is a qualifying resident alien with an SSN valid for employment is eligible for the payment only if he or she is a qualifying resident alien in 2020 and may not be claimed as a dependent of another taxpayer . An alien who received a payment but is not a qualifying resident alien for 2020 should return the payment to the IRS by following the instructions as described in Topic I: Returning the Economic Impact Payment.
Taken from
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-a-eip-eligibility
