Hello anonymous user ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
It is not possible to change the private IP Address Space for a Virtual WAN Hub post creation.
It will show grayed out in UI as below:
I also tried to test it via Update-AzVirtualHub PowerShell cmdlet and received below error:
Hence, it is a design limitation.
The only workaround is to delete and recreate the Virtual HUB with the new private address space that you want.
Kindly let us know if the above helps or you need further assistance on this issue.
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