Hi @gborg and @jackied
My name is Patrick and I'm a Community Manager at Splunk. Thank you both for reporting this error you're hitting trying to access your ES sandboxes, and apologies you had to experience that!
I escalated this issue internally and teams are investigating now. Seems to be a reproducible issue. For the time being, the workaround that has worked for the team is clearing the browser cache. Doing that has gotten them past the "Unexpected System Error" and were able to access the sandbox again. Please try that for now and let me know if that works. I can update more here once the team resolves the underlying issue.
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