Yeah, there's no mandate for government agencies to use login.gov AFAIK, so they can either go with login.gov or buy the private id.me solution. In general it's not a slamdunk to get agencies to cooperate and use their services, it seems.
https://legis1.com/news/logingov-technical-issues-gsas-platf...
> GSA has closed most of the gaps GAO identified in 2024 and 2025, but the remaining recommendation has a direct operational consequence. GSA has developed a public roadmap and created a Partner Advisory Group, but GAO says those steps do not demonstrate that the specific technical challenges agencies identified have been resolved or that mutually agreed-upon time frames have been established.
> GAO will continue monitoring GSA's progress. Until those time frames are established, the federal government's government-wide identity verification service retains an unresolved implementation gap as fraud and identity-theft threats continue to evolve.