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LTI 2.0 Certification: Getting 400 when sending Tool Proxy Profile to Tool Consumer

LTI 2.0 Certification: Getting 400 when sending Tool Proxy Profile to Tool Consumer

Hello , All

I can not pass my Tool Provider registration to continue LTI20 certification tests here https://www.imsglobal.org/lti/cert/index.php.
Getting HTTP 400 as response to sending Tool Proxy Profile (generated by my app) to Tool Consumer (certification tool). I've tried both: our application and lti2 sample app(downloaded from https://github.com/sakaiproject/sakai/tree/master/basiclti/basiclti-docs...). And in both cases I'm getting the same error: "400 Bad request" with empty response.

I have LMSs (Moodle and Sakai) working fine with my LTI Tool Provider using LTI20 registration but I can not get it working with certification tool and error message is not very helpful =) Just have no idea about what is the problem. Can you please help me to understand what is wrong here ?

I've tried many times with different combinations, so log records may be littered, please let me know if i can provide any other information to simplify research.

Thank you a lot