It depends on the reason provided for the rejection.
If your return was rejected because you claim your daughter as a dependent, and she is covered by your ex-spouse's Marketplace insurance, then a Form 1095-A should have been issued showing your daughter's coverage. This would not affect your Child Tax Credit, but you won't be able to file electronically without resolving the Marketplace insurance issue.
See this IRS webpage for more information regarding what to do if your return was rejected for missing Form 8962.
The person who enrolled a family member in Marketplace health insurance coverage for 2021 should have received Form 1095-A, Health Insurance Marketplace Statement, from the Marketplace. The Form 1095-A shows the months of coverage and any Advance Premium Tax Credit paid to the Marketplace health insurance company for the coverage. If you did not receive a Form 1095-A, you should contact the Marketplace from which your daughter received coverage.
Because your daughter is your dependent, you should be provided with the form.
If you receive correspondence from the IRS, reply right away and explain the situation.
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