this is from the IRS FAQ's - see below
Get My Payment will show the status of your second Economic Impact Payment and your most recent first payment. Some people received their first Economic Impact Payment in multiple payments. If you received multiple EIP 1 payments, the application will show only the most recent EIP 1 payment.
For EIP 2, Get My Payment will display one of the following payment statuses:
Payment Status Not Available
–You will need to claim any additional amount you may be entitled to on your 2020 tax return as the Recovery Rebate Credit.