We are currently using Skype for Business 2015 edition in our on-premises environment.
We need an assistance to migrate our Skype for Business 2015 to 2019 edition.
Our environment is includes of Skype for business Front End, Edge Server and Reverse Proxy environment. We required your assistance to migrate all the products regarding Skype for Business to 2019 edition.
When I tried to download a existing topology in SFB 2019 server I am getting "Unsupported Topology" error and it states that "This topology contains server that are running different legacy version of Skype for Business server. Before you can publish or save this topology, you will need to ensure all the of the legacy server in the topology are running the same previous version of skype for business server"
Please kindly help us on to migrate the SFB 2015 to SFB 2019