session initiator / wayf question

[Nate Klingenstein]

But this started after we did a data center move so I have to assume that the issue is on my side, no?

It might give you a hunch on where to start, but I don't think you 'have' to(or should) assume anything here.  It's just logs.  Look at the cookie in the request to the application.  Something is going to be wrong in processing that request, whether it's the URL requested, or with the wrong attributes, or with schema invalid nonsense, or so forth.
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