@davecason wrote AUF#MXRT (or was it AUP#MXRT ?
This could be code for "A(ppropriate) U(sage) P(olicy) (#) M(a)X(imum) number of) R(ecipien)T(s has been exceeded".
Ask Support if they will increase the maximum number of recipients to a larger number, e.g., 50, IDs in your SAR group?