Select a specific Client certificate in Mutual authentication

Hi there,

At the moment multiple client certificates are uploaded in the Admin Console -> Certificates, i.e. certificateA and certificateB. After integrating with an Azure SOAP webservice we got a HTTP 403 "Invalid client certificate". It turned out that certificateA was being used for authentication while they expect certificateB. After uploading certificateB again to the Admin Console, certificateB was being accepted by the Azure webservice. 

For a more long term solution, is it possible to send certificateB specifically without taking into account the order of upload of the client certificates?

Thanks in advance!