We recently encountered this error message whilst integrating to Azure AD. In our case we found that SP-initiated sign-ons were working, however IDP-initiated sign-ons from the myapps.microsoft.com portal were not. I haven't check if this was the same as the OP's issue.
Genesys Care identified the root cause to be with way the custom attributes had been created in Azure, those attributes being OrganizationName, ServiceName and email (https://help.mypurecloud.com/articles/add-microsoft-azure-ad-premium-single-sign-provider). Turns out that when creating the attributes, Azure AD automatically defined a namespace for them of the same name. So our SAML response had entries like this:
<Attribute Name="OrganizationName/OrganizationName">
<AttributeValue>mycustomername</AttributeValue>
</Attribute>
Problem was resolved by setting the namespace to blank. Hope this helps.
------------------------------
Mark Goldsmith
NTT Australia Pty Ltd.
------------------------------
Original Message:
Sent: 02-01-2019 17:15
From: Stephen Ward
Subject: SSO returning Oh No something went wrong
Thanks I've confirmed the cert is correct. Still getting error after successful login to AD FS.
------------------------------
Stephen Ward
Calibrus
Original Message:
Sent: 01-31-2019 02:59
From: Jari Riihimäki
Subject: SSO returning Oh No something went wrong
We have seen similar error when the SAML signing certificate were changed on IdP and it needed to be update in PureCloud.
(Note that the SAML certificate must be modified and "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----" lines must be deleted before .cer file is uploaded to PureCloud)
------------------------------
Jari Riihimäki
Vintor Oy
Original Message:
Sent: 01-30-2019 13:50
From: Stephen Ward
Subject: SSO returning Oh No something went wrong
I'm trying to get the AD FS integration to work. After following the instructions I get an Error Message "Oh No Something went wrong."
If I go into debug on the Browser and on the network tab I see Im getting a 404
https://login.mypurecloud.com/request not found.
#Integrations
------------------------------
Stephen Ward
Calibrus
------------------------------