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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;
}