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I believe it's possible; I am working through this as well. But @Shane Kleinert is also helping me on the side too. Good Dude here.

Yea what @Steve Noel posted is a good start, but there are more backend parts to it for Adaptive Auth. For me, I wanted to use the Customer URL parts for the Multi URL that is in preview. https://docs.citrix.com/en-us/adaptive-authentication/related-adaptive-authentication-configurations.html#custom-workspace-url-or-vanity-url

This depends I guess on specifically what URLs also in general. You can have multiple Workspace URLs (tied to *.cloud.com) but then only ONE "Custom" Workspace URL if you are talking about any BYO URLs. Those multiple *.cloud.com Workspace URLs can have diff branding/themes, etc. if doing that. Adaptive Auth would be your AAA vServer if you needed to get crazy with different nFactors flows behind that whereas Workspace Natively without Adaptive Auth you can only do one IdP as your primary auth point today otherwise. Adaptive Auth will work with all sorts of combinations here as even the Custom Workspace URL can also work in conjunction with the default *.cloud.com URL (not sure about multiples of those with the custom). Thx