SSL is usually done with a public and private key pair. When you want to secure communications between two things, the sender encrypts the data, gives that to the receiver who then decrypts it.
My favourite analogy is that the public key is a padlock, and the private key the only way to unlock a padlock. You hand out copies of the padlock to anyone who wants to talk to you securely, they lock up their messages, and you're the only one who can unlock the padlock with the private key.
Anyway, MS-Teams and Jira both run over SSL, so to enable communications between them, you are going to need to provide the public keys they use.
Have a look through https://community.atlassian.com/t5/Marketplace-Apps-Integrations/Where-can-I-find-the-public-key/qaq-p/1319578 - that covers the various integrations between Jira and MS-Teams you might be using
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