ONTAP System ManagerのSAML認証（Shibboleth/OKTA）でドメインユーザーの識別に失敗しました

環境

• ONTAP 9.5
• OnCommand System Manager
• Okta SAML 

問題

ShibbolethでSAMLを設定した後、OnCommand System Managerにアクセスしようとすると次のエラーが表示されます。

The SAML service provider did not identify the user that was authenticated.
Ensure that the SAML identity provider is configured to include in its assertion a "uid" attribute (SAML name "urn:oid:0.9.2342.19200300.100.1.1") whose value
matches the service provider user name.
Authorization failed for the resource at "/sysmgr/"