There are a few possible scenarios that can cause the Enterprise activation profiles to fail to install. It could range form issues with the policy itself in EMM, SSL Portal certificate chain not fully installed in the Windows certificate store, activesync related issues, or additional IIS components installed that could be conflicting with EMM. I would suggest that you follow KB75434 and enable debug logging on the EMMPortal and EMMHub components and replicate the isuse a few times in order to capture all the data. You can then run a MER tool and contact Support to further analyze the logs and help resolve your issue.
If you don't have any users provisioned and are willing to try a solution that could potentially fix the issue... you can try to uninstall all emm components (do not delete installation directories), remove the IIS role from Windows, restart, and install EMM again. As long as you select the option to "use configuration from previous installation" all the previsous settings and database options will automatically populate and your policy settings and configurations in the database will be used. The EMM installer will install and configure EMM according to EMM specs and in many occasions this will fix these profile issues that could potentially be caused by IIS or SSL cert chain issues.
I apologize for the late reply.
Thank you for your time and effort on this.
I did a complete reinstallation of emm and let the setup install IIS instead of installing IIS separately.
After puttying the certificates in place and configuring the FW, everything was running perfectly!
Unfortunately I don’t know the cause, but I’m sure it was something in IIS or the communication between emm and IIS.
Thank you for the update Maxime. I'm glad that fixed it for you.
also I noticed a typo in my original response that probably made the response a bit confusing:
"The EMM installer will install and configure EMM according to EMM specs" should have read : "The EMM installer will install and configure IIS according to EMM specs"