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Since you've copied the servergroupcertificate.cer and privatekey.bin from your functional primary and then added the cert via setup assistant to your switchover B, have you checked the certificate directory on your switchover B server to ensure that it does have the correct certificate in the servergroup directory?
If that is correct, then your next step could be have wireshark running during Interaction Center startup on your backup server to try to look at the SSL handshake and confirm what certificates are being presented. This would give you a better indication as to why the negotiation is failing.
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