ssh-gssapi fails when user have "instance " part

[jay alvarez]

Hi,
    I created a user with an instance "mis"
 
 jay/mis at OUR.REALM
 
 and tried ssh'ing to one machine configured to accept gssapi ssh authentication, however, to my surprise, gssapi authentication failed. Now what I did was to create another principal, this time removing the instance "mis" 
 
 jay at OUR.REALM
 
 and the authentication succeeded.
 
 I tried creating an mis group and putting "jay" into it (just trying my luck) but still authentication fails.
 
 Any idea how ssh should handle user accounts with instances??
 
 Thanks.
 
			
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