Hello, I’m Virginia an independent advisor with 20 years of expertise in fixing my own & friends’ PC problems.
Which Windows 10 build are you running - 1909, 2004, 20H2 or 21H1?
Do you run any VPN? If so disable this or set your geographical location to the correct area & try updating again.
Do you use a third party antivirus software? If so try disabling this.
Have you tried resetting the update components?
Open cmd prompt/powershell with admin & enter:
Net Stop bits
Net Stop wuauserv
Net Stop appidsvc
Net Stop cryptsvc
Ren %Systemroot%\SoftwareDistribution\DataStore DataStore.bak
Ren %Systemroot%\SoftwareDistribution\Download Download.bak
Ren %Systemroot%\System32\catroot2 catroot2.bak
Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat"
Net Start bits
Net Start wuauserv
Net Start appidsvc
Net Start cryptsvc
Restart the PC & try updating again.
And/or:
Search for services.msc & find Windows Update & ensure it is set to Automatic.