Error connect to custom server from android

08-08 11:19:01.151 29821-29912/com.kunsubin.lqky.meetingroom E/ReactNativeJS: ‘[__filename]’, ': ', ‘Failed to load config from https://room.surelrn.vn/config.js?room=jj’, { [TypeError: Network request failed] line: 142, column: 2655, sourceURL: ‘index.android.bundle’ }
08-08 11:19:01.189 29821-29913/com.kunsubin.lqky.meetingroom E/unknown:ReactNative: console.error: “[__filename]”, ": ", “Failed to load config from https://room.surelrn.vn/config.js?room=jj”, {“line”:142,“column”:2655,“sourceURL”:“index.android.bundle”}

You need to add an intermediate certificate of the issuer to the server, seems not the whole chain is configured.
There are multiple online sites which you can test your server: https://www.digicert.com/help/, https://whatsmychaincert.com/