I was able to create a message using Chrome on January 5th (with IE it always fails for timeout). Some functionalities such as the access data seems to do not work properly at the moment, in my case access data was provided but when you re-edit the message, the overall status says that access data is not provided.
There is now an official message :
SAP Service Marketplace currently not available
System not available
Please be informed that ths SAP Service Marketplace is currently experiencing an issue affecting availability. We are already working with highest priority on it to solve this situation.
Please try again in a few minutes.
In urgent cases like Prio 1 messages please contact the CIC directly: