IMS command from Master Console does not work

[CHMB1968]

Good morning,

Commands from the master console are apparently not processed by IMS11. "/DIS A" for example returns nothing to the operator master console. The name of the IMS system is IVP1. I also tried IVP1DIS A and no results.
In IMS1110.PROCLIB(DFSPBIV1) the parms are:
CMDMCS=Y,
CRC=/,
IMSID=IVP1,

There are 4 IMS jobs running
JOBNAME
IMS11RL1
IMS11CR1
IMS11DL1
IMS11RC1

I appreciate any help.

Thank you.