Hi Subramanyam MSB,
Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.
Can you specify the Solution Builder (server hardware vendor), Platform series/generation you are using and Azure Stack HCI Version you are deploying?
Can you please share the snippet of the full error or attach the file, so that I can help you provide better solution.
Overview of Cluster-Aware Updating (CAU), a feature that automates the software updating process on clustered servers while maintaining availability.https://learn.microsoft.com/en-us/windows-server/failover-clustering/cluster-aware-updating
The below link gives troubleshoot solution updates for Azure Stack HCI, version 23H2 https://learn.microsoft.com/en-us/azure-stack/hci/update/update-troubleshooting-23h2?source=recommendations This article describes how to apply a solution update to your Azure Stack HCI cluster via PowerShell. https://learn.microsoft.com/en-us/azure-stack/hci/update/update-via-powershell-23h2#sideload-and-discover-solution-updates
similar Q&A link: https://learn.microsoft.com/en-us/answers/questions/2028748/how-do-i-resolve-a-failed-azure-stack-hci-23h2-sto