Hi Cosmos,
We have just tested this scenario (with portable Viewer) , everything seems to work well. See the attached screenshots.
May I ask if you exactly followed the procedure provided in
portable viewer update guide ?
Also, make sure that you explicitly allow the signed in user to use the key. In order to do that:
1. In the License deployment window select your key and click Edit.
2. In the Edit dialog click Applies to..
3. Select the user from the user list and make sure "All access / Allow" is enabled.
I assume that you might have missed that step. Currently, we are updating our documentation so more detailed instructions for this specific feature are comaing. Sorry for the inconvenience.