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I would definitely prepare and file the 1040X to report the AUR income. ACS generally doesn’t accept the 1040X over the phone but you may be able to e-file the 1040-X in a few weeks instead of having to mail it in for processing.
In the meantime, I recommend using OPA (the online service) to try setting up the installment agreement because the set up fee is usually lower. However, if your client is not in compliance then it may not work and then you’ll have to call in to figure out what’s needed.