@Suki Singh,Thank you for posting in Microsoft Q&A forum.
According to your description, I know that you encountered an issue and after you tried the recommended fix method, the windows update did not prompt to update.
Based on my researching, I found that there are some methods you can refer to solve the issue:
1.Restart the device.
2.Restart the Windows Update service: Sometimes the Windows Update service may become stuck or not start properly. You can restart the service by pressing the Windows key + R, then typing "services.msc" and pressing Enter. Find the Windows Update service, right-click on it, and select "Restart."
3.Unassign and reassign the update ring policy to the target device.
If above information working, but you still get the error code0xC1900101, based on my researching, the error code is related to driver problem, we suggest that you contact Windows support to get more help.
I noticed that you have already tagged windows11, please wait for Windows Support to help you. If there is no response for a long time, we suggest that you open a phone case to get more help.
Thanks for your kind understanding.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.