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Two possibilities:

1. Entry error: When you look at your personal information section, you should see the child listed as nondependent for EIC/dependent care only. If yours is different, go back through the interview and check your answers. You do qualify for those credits as the custodial parent. 

2. He claimed custody. Possibly your ex went ahead and claimed that the child lived with him. Then your return would reject and you would need to print and mail your return with a letter explaining you were the custodial parent for 2023

Here is a screenshot of my fake return for custody of the child but not claiming as a dependent