enforcers in SEPM can't be seen

Hi,

The SEPM server can ping the enforcers and I can ping the SEPM server.

We had also configured on the enforcer the ip of the sepm, port and key

Base from the forums, the pre shared key of the enforcer and SEPM should be the same. this should be properly configured, the enforcers will automatically show on the admin>server lists without configuring from the server.. Is this correct?

My problem is, it might be the pre shared key but I don't exactly remember when that key was asked during the SEPM installation.

Since I'm using 12.1 RU2, is there a way to verify the pre shared key and to correct this?

Do I have to change the key in the enforcers?

Do I have to re-install the SEPM?

Thanks