Mini Orange is a great plugin for SAML SSO integration into Azure AD.
Their documentation is located HERE

The documentation misses a few key points.

• The SP-EntityID / Issuer url must be: https://wordpresssite.com/wp-content/plugins/miniorange-saml-20-single-sign-on and not https://wordpresssite.com/wp-content/plugins/miniorange-saml-20-single-sign-on/

  Attribute Mapping

• User Name: Email Address
• Email: Email Address
• First Name: Given Name
• Last Name: Surname