I have the exact same issue. Do we know if the mailing address provided is truly wrong? Perhaps, the people who would normally be at that address to receive our mail have been fired??
I mailed my 8453 form and supporting documents on 4/7/25, certified. USPS tracking says the same as you, Available for Pickup, meaning can't be delivered.
I also mailed, certified, my Q1 estimated taxes, to a different address, on 4/7/25. That hasn't been delivered yet either. Headed to Louisville, KY. That address may have weather problems. USPS says "Your package will arrive later than expected, but is still on its way. It is currently in transit to the next facility". I'm pretty sure the payment will be received and cashed.....
