Hide Convert Option for a set of users

Summary:

I am trying to hide the convert option on pending worker screen. Used EL expression for the same. When I try for only one user using the below Expression, I am getting the desired result.

#{securityContext.userName !='400007362'}

However, when I am adding more users the EL Expression, it is not working. The users are still able to see the option.

I used the below EL expression for multiple users.

#{securityContext.userName !='400007362' or securityContext.userName !='212439944' or securityContext.userName !='212565197' or securityContext.userName !='212597544' or securityContext.userName !='212689370' or securityContext.userName !='324009658' or securityContext.userName !='400007442' or securityContext.userName !='400008071'}