"Our service is down because Azure is down" definitely sounds like scapegoating (regardless of whether it is the case, Soluto should have a contingency plan)

That's not scapegoating, it's pointing at facts. Sad as they are. When you have a complex web service, you rely on a provider. That provider can go down sometimes, and it takes you with it. Again I'll point to Netflix and AWS, they waited until AWS were back up, they didn't "restore a backup" somewhere else.

It wouldn't be scapegoating if their site was still up and their service still functioning, hosted by some alternate provider, for example. But since their site and service aren't up, I think it can be seen as scapegoating.