Is anyone here using Compliance Manager to perform IT audits

Indeed the Microsoft Purview has a provision for ISO  27001:2013 and following the prompts under Compliance/Assessments, you can select the services you would like to include or add new services to the scope of an Assessment. Once you have completed filling in the details for the assessment, you can view your created Assessment under Assessments to understand areas for improvement under Improvement Actions which is rich and detailed as it suggests area to improve based on the service highlight risk areas which can serve to prioritize improvements. You can use the Reports Section under Compliance Manager to generate to completed assessment. I would encourage you to try it out and view the results of the tenant you are interested in.