Provided you're preparing a full year 1040, have entered a valid SSN (well, at least, one that doesn't trigger a warning for "invalid value"), and have entered -1 for both of the following, PTO will compute full Recovery Rebate Credit:

• Economic impact payment 1 received as shown on Notice 1444 (enter -1 if zero). Don't include any amount returned to the IRS
• Economic impact payment 2 received as shown on Notice 1444-B (enter -1 if zero). Don't include any amount returned to the IRS

You may want to double check you entries under Credits > Recovery Rebate, EIC, Residential Energy, Oth Credits.