DD6300 should be running DDOS 6.0 or newer which is using the new license format ELMS. You should be able to upload the file that was emailed to you to the data domain GUI. I don't believe the legacy 20 digit key is ever used on a DD6300.
If your not able to upload the license file as described in the release notes and admin guide I believe the next step would be to open a support ticket.
stephanbeck
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Posted October 21st, 2017 03:00
Anyone?