Greetings!
Though the triumph doesn't mention it, the solo run has to be completed in one-sitting, which means, that the run has to be from start to finish, without disconnects, error codes, or checkpoints.
Edit: You'll have to run it again, unfortunately.
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That's rather annoying but thank you looks like we're going again atlest I have a good idea what I have to do and the builds I need
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No worries, best of luck!