SSL security certificate error

I have an application that connects to an API, which we recently changed servers for. The new server has an SSL security certificate from the provider Sectigo installed at the IIS level, which certifies the website correctly.
Now, whenever we try to make any queries from our application or from Postman itself, we always get the following error:

A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)

Has anyone encountered the same error and/or knows how we can solve it?
Thanks

Hi @aerospace-administ15. Welcome to the Postman Community.

You need to add and configure the necessary certificates in Postman. Head here to learn how you can do that.