I just installed and configured a new ADFS server. After the configuration I wanted to test out ADFS login using this address - https://sts.corp.viamonstra.com/adfs/ls/idpinitiatedsignon but it failed with this error:

The resources you are trying to access is not available.

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Event log showed this error message

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Quick configuration check with Get-ADFSProperties cmdlet and I discovered that by default it is not enabled.

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Use the Set-AdfsProperties -EnableIdPInitiatedSignonPage $True command to enable the login.

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Best