Can't add altRecipient using LDIFDE

Hello,

I will be forwarding email for many users for an upcoming project. The forward will point to a contact created for each user. Unfortunately, I am having a hard time adding altRecipient and then pointing it towards the appropriate contact.
Command:

C:\>ldifde -i -f c:\alt2.ldf -j c:\logs

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Here is the test .ldf file:

Dn: CN=Test Student,OU=Class2016,OU=Students,DC=School,DC=edu
changetype: modify
add: altRecipient
altRecipient: CN=Student Test,OU=Student.school.edu,OU=Contact OU,OU=Contacts,DC=School,DC=edu

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-

Here is the error I get:

"Connecting to "server.school.edu"

Logging in as current user using SSPI

Importing directory from file "c:\alt2.ldf"

Loading entries
1: CN=Test Student,OU=Class2016,OU=Students,DC=School,DC=edu
Entry DN: CN=Test Student,OU=Class2016,OU=Students,DC=School,DC=edu
changetype: modify
Attribute 0) altRecipient:CN=Student Test,OU=Student.school.edu,OU=Contact OU,OU=Contacts,DC=School,DC=edu

Add error on entry starting on line 1: Constraint Violation

The server side error is: 0x20b5 The name reference is invalid.

The extended server error is:

000020B5: AtrErr: DSID-03152804, #1:
      0: 000020B5: DSID-03152804, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 2007e (altRecipient)


0 entries modified successfully.

An error has occurred in the program"

Yes, the contact CN is "Student Test" and the account CN is "Test Student".
Yes, there is an escape character "-", but for some reason, EE won't show it.

I've played with it for quite a while and still got 'nuthin.

Any help is greatly appreciated!