I've also seen a ton of refused affiliations/logins from WSP radios on multiple puget sound region IWN sites.
Edit: Going through past notes, may reveal why...
Quote:
WSP elected not to proceed with further implementation of the automatic roaming function for the Land Mobile Radio System project. As configured, automatic roaming does not meet the agency’s business needs. To meet state patrol user requirements, WSP is leveraging a combination of WSPs trunked system and manual roaming to the FBI trunked system. The decision to not implement the automatic roaming function has a positive impact on the project schedule and budget and stabilizes scope. The project anticipates completion by July 15, 2020, and the cost to complete is less than originally estimated. The project made significant progress to resolve project challenges and now has a solid plan to move forward. While scope, schedule, and budget are stable, the project is assessed yellow as the recent decision is implemented.
So, WSP is only gonna be using IWN in an emergency, it sounds like.