Yesterday we noticed that it was not possible anymore to log on using the wpo365-login plugin. This as a result of a small update Microsoft had made to how it publishes the public keys needed to decipher the (identity) information the plugin receives. With the latest update 2.9, this issue is now resolved.
This issue illustrates that it is very important that a WordPress administrator can still logon using his/her WordPress-only account. Otherwise it would have been problematic in this case to update the plugin to resolve the issue.
Thank you for choosing our plugin and tell us about your experiences so that we can continuously improve our software.
You can also find this information on Yammer and on Twitter.