Microsoft wants you to ditch your old OS so you can try its new one stuffed with overbearing, if not invasive, AI features.
If Windows Update says your desktop or laptop doesn't meet the requirements for Windows 11, a bit of work under the hood could make it happen anyway.
These End of Service notifications originate from the EOSNotify and OobeUpdater processes. These can be disabled using several ways, including modifying the Windows Registry, disabling Scheduled tasks ...