Most customers are now logging in without error. We'll continue to monitor before closing this incident.
Latest update from Microsoft says their engineers are rolling out a fix and we should expect full recovery within 60 minutes.
We use a Microsoft Authentication service that is currently causing issues for Calxa customers. In some cases this results in an error page when attempting to sign in and in other cases you may just see the Calxa bubbles animation.
Microsoft engineers are currently investigating. See the Microsoft Azure Status page (https://status.azure.com/en-au/status) for more details.