400 Error after Logout from Anaplan

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We have just setup SSO for one of our Anaplan Workspaces… Whilst users can login we have the following user journey which gives them a 400 Error from our SSO provider.

1. User logins via our Workspace portal and is taken to Anaplan
2. User logs out of Anaplan
3. User goes to Anaplan login website: https://iam.anaplan.com/login

User gets the following error:

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