Some Web browsers are really "helpful" and will cache pages. This becomes a problem if a page updates often. Or, if a page redirects to a different page, but only does so for a short period of time.
When Roku is down for maintenance (it really doesn't happen often) they'll redirect to a Down For Maintenance page. And those "helpful" Web browsers will cache that, meaning that next time you go to the page, you'll get redirected to the Down For Maintenance page when you shouldn't.
Clear your browser's cache. Or use a different browser. Then try again.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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