Army 365 webmail shows a blank login that asks for your full email

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Symptoms

Going to https://webmail.apps.mil shows a generic Microsoft sign-in instead of auto-detecting your CAC.

Likely cause

Army 365 requires home-realm discovery via your email address before redirecting to the federated CAC login.

Fix

1. Type your full Army 365 email: firstname.middle.last.mil@army.mil (or .civ@army.mil for civilians). 2. Click Next. 3. Choose 'Sign in with CAC/PIV'. 4. In the certificate picker, choose the certificate labeled 'Authentication' (not EMAIL). 5. Enter your 6-8 digit PIN. 6. Approve any 'Stay signed in' prompt.

Sourced from militarycac.com. Rewritten for clarity.

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