For Federated customers, all the servers in the federation infrastructure are in the critical path, and customers can gradually migrate from either PHS or PTA using staged rollout. 

For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy.

Also, if you need any further assistance then you can raise a support ticket (https://cloud.foetron.com/) and get it addressed.