Description of the issue
This is a feature request not a bug report.
Add a boolean SecureSignInSessionIsEnabled parameter to AADConditonalAccessPolicy which sets the value of the SecureSignInSession.IsEnabled flag in the policy.
I am happy to write the PR if no one already has this on their TODO list.
Microsoft 365 DSC Version
dev
Which workloads are affected
Azure Active Directory (Entra ID)
The DSC configuration
Verbose logs showing the problem
Environment Information + PowerShell Version