Please log in via your IDP Initiated link (if available). If an IDP Initiated link is not available use the SP intended link located under Setup > Security > Security Settings > SSO > SP Initiated link.
Please note password resets and login attempts will fail after SSO has been enabled, even if the password is correct.
It can be found here Setup > Settings >Security >Single Sign-On Settings It will look similar to the following
https://mc-XXXXXXXXXXXXXXXXXXX.login.exacttarget.com/sso/XXXX
000389251

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