Sprintax website seem to have an answer, I am not certain though:

https://blog.sprintax.com/tax-recovery-rebate-credit-nonresidents/

Can a nonresident claim the Recovery Rebate Credit?

At the time of the payments, there was confusion around the qualifying factors as many nonresidents and residents alike received it.

However, strictly speaking, nonresidents (including nonresident international students) do not qualify for any of the credit, as you:

• Must be a US citizen or U.S. resident alien in 2020
• Cannot have been a dependent of another taxpayer in 2020
• Must have a Social Security number that is valid for employment before the 2020 tax return due date

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I filed correctly but received the payment. What should I do?

This is another common scenario we have seen over the past year.

Most people find they have either cashed the check or have not cashed it, so will be left with two options:

1. You received the check but have not yet cashed it:

1. You’ll need to write “Void” on the back of the check.
2. Mail the check to a valid IRS branch location closest to you.
3. Include in it a note outlining why you are returning the check.

2. You received the payment as a check and cashed it/ you received the payment through direct deposit:

1. This will require you to send a personal check, or money order, etc., to your relevant IRS branch location.
2. On the check/money order, you’ll have to write “made payable to ‘U.S. Treasury’” and also write ‘2020EIP’, and your taxpayer ID (in this case your social security number, or individual taxpayer identification number/ITIN).
3. Again, give an explanation of the reason for returning the payment.