Azure Enterprise Application - Cannot retrieve metadata for IdP

[dev90001]

Occasionally we are getting the following error when a user logs into Moodle:

SAML2 exception: Cannot retrieve metadata for IdP 'https://sts.windows.net/guid_removed/' because it isn't a valid IdP for this SP.

Is this the correct way to configure the SAML2 plugin for an Azure AD Enterprise Application? This appears to be working most of the time, however the exception above is thrown sometimes upon login.

Basic Saml Configuration

Name	Value
Identifier (Entity ID)	https://example.com/myapp/auth/saml2/sp.metadata.php
Reply URL (Assertion Consumer Service URL)	https://example.com/myapp/auth/saml2/saml2-acs.php
Sign on URL (optional)	(blank)
Relay State (optional)	(blank)
Logout Url (optional)	https://example.com/myapp/auth/saml2/loutput.php

There does not appear to be any documentation relating to how to config Azure AD Enterprise Application using SAML SSO. Is this scenario supported?

Currently using: 27_34STABLE