Logged in as a non-fleet admin user, navigated to a project and created a new floating IP (in my case, I didn't specify an IP pool and just used the default). I got a response that the floating IP was created successfully. But the UI also threw a "Page not found" error:
Navigating back to the Floating IP list, I saw the new floating IP in the list.
Looking at the browser debugging console, the error in question was:
{
"request_id": "27698aa1-8628-4389-b7b9-a17cd165ccd7",
"error_code": "ObjectNotFound",
"message": "not found: ip-pool with id \"2d552cb7-c413-4f1b-9f1c-c2bed64a6ce9\""
}
The ip-pool id referenced is the default IP pool for the current silo, the pool from which the floating IP was created.