What happens if you forgot to endorse check?

I deposited a check using my iPhone "chase quick deposit" but I forgot to sign the back will I get declined or something?

I know when I do similar, it tells me the qualifications weren't met (usually tell you what), and to retry later (usually you can after you get the notice.) I don't think you'd get in trouble or anything, they'll most likely just tell you to endorse the check and try again.

I have never endorsed a check deposited