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You're using typescript? Try creating the object that has the key (the object after "userAssignedIdentities:") inside an Apply block

Like:

```userAssignedIdentities: userIdentity.apply(x =&gt; ({
  [x]: {}
})```

And that did the trick. Thank you very much!

Yeah! That Azure API is a weird one, a map with keys and empty objects :man-facepalming:

In case it ever comes up again or you see something similar, the Pulumi engine generally expects keys of objects or maps in all languages to be strings, not Output&lt;string&gt;

I still have nightmares because of ARM templates.
So I don't complain too much. This is much better and quite refreshing. :smile: