Hello
What resources are you trying to sign into? What website, or what app?
Are you signing in using a work/school account?
Or, if you are using a personal account, are you signing into a file or a meeting shared with you from an organization user?
The error basically indicated that you accessed restricted area managed by organization. The admin referenced here is the organization admin, not your computer local admin. So it can be that your user doesn't have permission defined by that organization to access what you were trying to access, or they have Conditional Access policy set up in that organization to restrict access when it comes to the type of browser, or geolocation, etc. Only their organization admin would know the specifics since every organization sets those differently.