@Richa Kumari, Thanks for posting in Q&A. The error message "domain not available" when trying to connect to a Cloud PC could indicate it is unable to connect to a domain controller. And I notice you already check the ANC connectivity to Azure AD and it is healthy. To troubleshoot the isue, I suggest open case to check int he backgound to get help. Here is a link with the steps to open case:
Thanks for your 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.