It does not matter if your return was rejected on e-file, you can still extend it.
Please see https://turbotax.intuit.com/irs-tax-extensions/https://ttlc.intuit.com/community/extensions/help/how-do-i-file-an-irs-extension-form-4868-in-turbot...https://ttlc.intuit.com/community/extensions/help/do-i-need-to-file-a-state-extension-if-so-how-do-i...
@djburge52
