Working with &OUT-parameter doesn't work

Hi.

I have a process for creating a distribution group i Exchange Online. This is some of the steps involved:

Step 1: Create O3EDL (works)
ResultingKeyParam

Value = "UID_O3EDL"

Step 2: Insert into O3EDLManagedBy (works)
val_UID_O3EDL:

Dim UID_O3EDL = "&OUT(UID_O3EDL)&"
Value = UID_O3EDL

This will result in:
UID_O3EDL = 1c9ff0b4-9afd-4d10-bcf5-ffc6da26c288
val_UID_O3EDL = &OUT(UID_O3EDL)&

Step 3:Mail result about the newly created DL (does not work)
BaseObject:

Dim OUT_UID_O3EDL = "&OUT(UID_O3EDL)&"
Value = New DbObjectKey("O3EDL", OUT_UID_O3EDL).ToXmlString()

<Key><T>O3EDL</T><P>&OUT(UID_O3EDL)&</P></Key>

/Henrik