Hi, If the instances got activated you should be able to subscribe. However let's say your instance got activated and after sometime cartridge agent could not send statistics to CEP, Stratos will mark the instance as a faulty member. Then Stratos will terminate the instance and spawn another instance in the same partition. Then you have to wait till that instance get activated in order to make subscriptions. Please share your new log files so we can identify the problem clearly.
Touched, not typed. Erroneous words are a feature, not a typo.