Hi, @MicMac
You are most welcome. The Unsupported server version potentially mean that you are running on an older version of Mattermost Server.
Can you please confirm that you are running on at least Mattermost Server 5.25 based on the mobile changelog documentation that we have here?
- Server Versions Supported: Server v5.25+ is required, Self-Signed SSL Certificates are not supported unless the user installs the CA certificate on their device