@KNERD - what number is on line 11 on the original 2018 tax return that was submitted? that is your 'tax'.
The credit for other dependents can reduce this figure by the LESSOR of $500 or the amount shown on Line 11.
If Line 11 was zero, you are not elgible for any part of the $500.
One other point.....if the amendment to obtain an additional refund on a 2018 tax return was not received by April 15, 2022, it would be rejected as it is past the three year deadline to file for the 2018 tax season.
