The Recovery Rebate Credit that was sent out by the IRS in 2021was based on the 2020 tax return on file with the IRS.
Since you are no longer married on your 2021 tax return and if your income in 2021 makes you eligible for the 2021 Recovery Rebate Credit there is no issue with you receiving the credit on your 2021 tax return.
Go to this IRS website for information on the 2021 Recovery Rebate Credit - https://www.irs.gov/newsroom/recovery-rebate-credit
