Got an overpayment notice, what now? after 18 years as an office manager

After 21 weeks of benefits I got a notice saying I must repay some of it. I do not usually post, so bear with me. The letter mentions an appeal window and a repayment plan. Are payment plans possible?

I asked for a waiver and a plan in the same call, and they gave me both forms. It was less scary than I expected.