Hello Putninš Rauls,
Thanks for your question.
As u rightly pointed out, as of now Conditional Access policies are not supported for ACS. There is currently no announcement regarding this feature as well.
If it is a feature you will like please go ahead and post here: https://feedbackportal.microsoft.com/feedback/
For credentials in ACS please take a look at Credentials in Communication SDKs for identity best practices in ACS
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola