This guide is related to the OWA on Exchange 2013 & 2016 SAML Application here.
Question?
How do you remove the SAML configuration for OWA on Exchange 2013 & 2016?
Answer
To remove Passly from OWA 2013 & 2016 we will need to follow these steps.
From Exchange Server PowerShell (Exchange Management Shell)
Get-EcpVirtualDirectory | Set-EcpVirtualDirectory -AdfsAuthentication $false -BasicAuthentication $true -DigestAuthentication $false -FormsAuthentication $true -WindowsAuthentication $true
Get-OwaVirtualDirectory | Set-OwaVirtualDirectory -AdfsAuthentication $false -BasicAuthentication $true -DigestAuthentication $false -FormsAuthentication $true -WindowsAuthentication $true
See this Microsoft KB for more help with Exchange Server PowerShell.