Symptoms
When you configure an Android mobile device, the server address's prefix is missing.
Yet, according to the online diagnostic at https://testconnectivity.microsoft.com/, the autodiscover configuration is correct.
Problem
Android has a distinct behavior if the email address's domain is resolved at the DNS level: if a website (other than BlueMind) exists at the address https://<bluemind.domain.com>, then Android attempts to retrieve the autodiscover configuration from https://<bluemind.domain.com>/autodiscover (or https://<bluemind.domain.com>/Autodiscover )
Solution
Configure the website so that it sends https requests to BlueMind:
location /autodiscover { rewrite ^(.*) https://bluemind.domain.com$1?$args permanent; } location /Autodiscover { rewrite ^(.*) https://bluemind.domain.com$1?$args permanent; }