Dynamic Security and Active Directory

I have a subscription based cloud application with tenant databases for each company that subscribes. Some SAP companies use Active Directory, but most of mine don't.
What is the best way to integrate both dynamic and/or Active Directory, in which they can choose when signing up , but my application would have to handle it dynamically of the choice. Since you can only choose one
in PHPrunner 10.91 as far as I know , how can I implemente both?

Without making two projects?