When configuring the proxy settings for each application, you can not use the same URL to use root-to-root mapping.
Set up a DNS alias so that each URL can be put into Cloud Access Manager distinctly.
E.g In DNS set up an alias that points to the original URL:
abc.my.cloud.company.com > my.cloud.company.com/tenant/abc
def.my.cloud.company.com > my.cloud.company.com/tenant/def
ghi.my.cloud.company.com > my.cloud.company.com/tenant/ghi
This would allow you to have three distinct root-to-root mappings in Cloud Access Manager.
Enhancement request 791416 has been submitted to Development for consideration in a future release of Cloud Access Manager.