APM - IdP endpoint not working, returns a 404

I want to connect BIG-IP APM with simpleSAMLphp SP. I followed this guide but when the SP sent the SAML AuthNRequest to the APM IdP, it shows a 404 error.

 

This is how my environment is configured (notice that ip and hostnames here are not real, but has the same look like that originals):

 

• Partion: Common
• hostname: f5.example.com
• IP Address: 10.4.12.133 (not real)

I created a Virtual Address 10.4.12.134

 

I created a Virtual Server named testsaml:

 

• Source Address: 0.0.0.0/0
• Destination Address: 10.4.12.134
• Service Port: 443 / HTTPS
• State: Enable
• SSL Profile (Client): Common/clientssl
• SSL Profile (Server): Common/clientssl

And using an Access Profile test:

 

• Partition / Path: Common
• Parent Profile: access
• Profile Type:All
• SSO Domain: Single Domain
• SSO COnfiguration: testsaml

And has an IdP: testsaml with the following data:

 

• IdP EntityID: https://f5.example.com/testsaml
• Artifact Resolution Service: /Common/testsaml
• Assigned Signing Key and Certificated: /Common/default.key /Common/default.crt

Also I registered the SP data and bounded it with the IdP.

 

Why when I do an SP-initiated SSO and the AuthNRequest is sent to the APM IdP SSO endpoint: https://f5.example.com/saml/idp/profile/redirectorpost/sso a 404 is showed?

 

Thanks for your help, I reviewed everything but I can not find the reason.