I have missed a claim response or appeal deadline. Does a late claim response means that the employer waives any rights it has in the claim, including the right to protest chargebacks to its tax account?
Failure to respond timely usually means one of two things - either the document was misdirected and the employer didn't receive it timely, or they did receive it timely and missed the deadline to respond. If the former, do respond back to the Agency upon receiving the document and advise that it was misdirected, thus causing the untimeliness. If it was received timely and there is a good business reason for responding untimely, advance that reason along with your separation protest as sometimes, the Agency may consider that there was good cause for the untimeliness. Irrespective, do send a response outlining the separation reason as the State will still consider that data even if they don't respond back with a determination advising of their finding.
Some untimely responses may be accepted if the employer shows good cause for the untimeliness, increasing the possibility of obtaining disqualifications and protecting the tax account. It also opens the path to the appeal process if the employer feels the untimeliness issue isn't valid and wants to pursue the matter.