Hi @Mohammed Kasim,
Not sure why other PCs have that group policy, but Provisionedhomepages is not a policy for new Microsoft Edge (Chromium). It is a group policy for Legacy Microsoft Edge. That's why you can't find it on the new Microsoft Edge (Chromium).
The Legacy Microsoft Edge is out of support now. Please configure the group policy according to the new policy documentation. For example, RestoreOnStartupURLs is the policy if you want to specify sites to open when the browser starts.
UPDATE
Please note that you are still configuring old policies for Legacy Microsoft Edge, which will NOT be applied to new Microsoft Edge.
You should refer to https://learn.microsoft.com/en-us/deployedge/microsoft-edge-policies for configuration, and install the policy template for Microsoft Edge per this tutorial.
For example, if you need to configure HomepageLocation, you should go to Administrative Templates/Microsoft Edge/Startup, home page and new tab page, and find "Configure the home page URL":
Or registry editor:
And the result:
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Best Regards,
Shijie Li