I have the same problem regarding ISSMP. Bought the online course + exam bundle. Completed the course, but can not schedule the exam. I have contacted member support EMEA, but have not received a reaction. I just wrote to the exam administration team as well in the hope that they can help.
@MEndres - Please be aware, however, that they are responding to cases in the order they are received, and a response can take up to 10 business days at this time. We apologize for any impact this may have and appreciate your patience with us. Thank you!
@Jishu - ive replied to your message on this thread - https://community.isc2.org/t5/Exams/Unable-to-schedule-exam/m-p/80548#M4363