Hi Rajesh Swarnkar,
As you are looking for an SKU plan of Win11 Single Session AVD image with Microsoft365 Apps which you cannot find in the Azure Marketplace is due to limitation of your subscription plan.
To use Windows 11 single-session AVD image with Microsoft365 Apps, try to check with Microsoft365 subscription plans. Checkout below documentation for more information. https://www.microsoft.com/en-us/microsoft-365/enterprise/microsoft365-plans-and-pricing?msockid=23850fecd4316be933a21a80d5636ae1
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