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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Microsoft uses a parameter called domain_hint that allows the RP to specify a preferred IdP. It’s modelled after the WS-Federation “whr” parameter.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It’s mentioned at
<a href="https://msdn.microsoft.com/en-us/library/azure/dn645542.aspx">https://msdn.microsoft.com/en-us/library/azure/dn645542.aspx</a>, where its description is:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i>domain_hint</i>
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">[Optional] Provides a hint about the tenant or domain that the user should use to sign in. The value of the
<i>domain_hint</i> is a registered domain for the tenant. If the tenant is federated to an on-premises directory, AAD redirects to the specified tenant federation server.<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If that will do the job, maybe we can write a mini-spec to standardize that.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> -- Mike<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Openid-specs-ab [mailto:openid-specs-ab-bounces@lists.openid.net]
<b>On Behalf Of </b>Edmund Jay<br>
<b>Sent:</b> Monday, May 18, 2015 5:10 PM<br>
<b>To:</b> openid-specs-ab@lists.openid.net<br>
<b>Subject:</b> [Openid-specs-ab] Spec call notes 18-May-15<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif";color:black">Spec call notes 18-May-15<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif";color:black">John Bradley<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif";color:black">Nat Sakimura<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif";color:black">Edmund Jay<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black">- Discussed the need for extension spec for supporting proxies in enterprise scenarios.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black">- RP Certification Testing<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black"> Nothing new has been discussed.<o:p></o:p></span></p>
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