Update: I just want to let you know that this issue has been resolved!
We are in the process of diagnosing and resolving an issue with Classic Editor (RVA) authentication. RVA users are not able to sign in. Anyone that is already authenticated can access it without problems.
The workaround, for now, is to use this URL (https://apps.risevision.com) to sign into Apps, at which point you can access RVA.
We appreciate your patience in this matter.
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