Hi Alex,
SCIM 2.0 as a standard still needs a lot of work. Some of the most pressing issues with SCIM include the lack of change detection (e.g.: delta query) and group membership pagination, as well as various attributes like the User resource's "roles" and "entitlements" that are inadequately structured and have interoperability problems. The issues I mentioned are already the cause of numerous problems today, and I think they'll be even more problematic with managing agent AI identities given the more complex topologies relative to the mainstream "outbound" provisioning scenario from Entra into SCIM-enabled SaaS apps.
Writing a draft regarding AI agent identities isn't a bad thing, but piling more workloads onto SCIM without investing the time and effort to fix the foundations of the standard is short-sighted, in my opinion. Is Microsoft still working on addressing issues with SCIM such as the ones above? I was working on these prior to the layoffs earlier this year, and I'd be pleasantly surprised if that work has continued in the months since.