If the parameters are set correctly then you just wait until SAP replies.
Most probably the Kernel and OS combination could be the issue.
A MAT link is provided to you by an SAP support agent when there is a need to upload trace files or heap dumps or core dumps for analysis from the SAP side to find out the memory leak.
This is provided when the file size is big and you are not able to attach them in the OSS message.
The MAT link is valid for a certain period of time and gets expired after that.
Regards
RB