DPNs move fast. The 21-day clock starts from the issue date, not receipt....

https://dlf-ne.org/how-do-i-spot-a-lockdown-dpn-before-the-client-wastes-money-on-the-wrong-step/

DPNs move fast. The 21-day clock starts from the issue date, not receipt. Managing the lockdown vs. non-lockdown fork is critical to protecting your clients. This guide clarifies the mechanics, so you can triage fast and keep options open.