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SAAS Integration API - Error Calling outbound endpoints

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Hi,
We started integration between BC SAAS and a third party using API v2.0 with OAuth2.0 and bearer tokens. 
The third party keeps getting the error "Error calling outbound endpoints".
The third party program fails to establish connection with Business Central because it doesn’t have a certificate that matches with target. 

To properly establish HTTPS connection, the third party software requires public certificate of the target endpoint – the certificate for the https://api.businesscentral.dynamics.com domain (every website/service/API accessible via HTTPS has at least one such certificate). The issue is that BC presents different certificates at different times.

Is there a way to get the same certificate in BC SAAS when establishing SSL/TLS (=HTTPS) connection between the third party software and Business Central?


 
 
Thanks in Advance

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