Microsoft AD FS professional required for debugging one error in relying party trust set up.

Hello, We have some application written over LAMP stack and hosted on Linux server on Amazon EC2 instance. We are now planning to allow customers to use their on-premises Microsoft AD credentials to authenticate on our LAMP application. Our client's infrastructure team sent this: "In order to integrate with our Active Directory we will require some information to set up a trust. Could you provide us with either of the following: Federation metadata address Federation metadata to file If you do not have these we can set up the trust manually, in which case you’ll have to provide us with the following: Token encryption certificate (optional) SSO URL (WS-Federation and/or SAML 2.0) ". We already managed to setup the trust. Now when user is authenticated while returning back to application we are getting some error in error logs. We are pretty sure that this error occurs because of some wrong certs configuration in SIgnature tab in relying party trust's signature tab. I have attached error log's screenshot for your reference. I assume this should not be a job more than couple of hours. Looking forward for an ongoing healthy business relationship. This task can be first of many upcoming future requests. Regards