The ATO’s 21-day DPN clock starts when a notice is issued. Accurately...

https://blogfreely.net/neasalnfbo/my-asic-address-is-wrong-can-i-still-be-served-with-a-dpn

The ATO’s 21-day DPN clock starts when a notice is issued. Accurately distinguishing between lockdown and non-lockdown DPNs is critical for your client’s strategy. This guide breaks down the mechanics of each, so you can triage fast and keep options open.