Ok small mistake on my part you're using the enablement package, Some of the time its due to the patch level and sometimes its the software distribution folder thats goosed
Ok Its not at the latest patch level which maybe giving you this problem, with latest patches your build number should be 19042.2130. try patching them and then use the Feature Update to Windows 10 Version 21H2 x64-based Systems 2021-11 Via enablement package. In the All Windows Feature Updates node search for 21H2 and right at the bottom you will find the update Just verify its downloaded and Deployed.
What you can also do if your latest patch doesnt apply is stop the sms agent host service, stop the windows update service, rename C:\Windows\SoftwareDistribution to C:\Windows\SoftwareDistribution.old. Restart the SMS Agent Host and Run a Software Updates Scan from the control panel. Thats should then verify all the patches deployed to the device and whats installed and hopefully install the Monthly patch or just allow the enablement to update the device.