1040-X

Can the IRS reject an amended federal return for some reason? I will be sending a 1040-X for not reporting $20 in income from HSA interest income (1099-INT). This was my first year doing my taxes and I got my 1099-INT after I had filed my taxes (a little too early). I am just worried that there will be something wrong with my amended return. My original returns have already been accepted and refunds have been deposited.