SAML authentication failed on the apigee developer portal

We use Apigee's SAML authentication on the portal and it hasn't worked for a few days.
After authentication on provider server, we return to the Apigee portal and that we have the following error:

Response doesn't have any valid assertion. Signature is not trusted or invalid
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The SAML configuration is up to date including the certificate.
Can you help me please?
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Hi Manu

It seems this is a matter you should address with the help of the  Apigee support engineers. They can help you to troubleshoot and diagnose this problem.