Login request does not provide the full Wellknown data. Change the model to reflect that, to avoid misunderstanding.

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/Credentials.kt

@@ -54,7 +54,7 @@ data class Credentials(
          * reconfigure themselves, optionally validating the URLs within.
          * This object takes the same form as the one returned from .well-known autodiscovery.
          */
-        @Json(name = "well_known") val wellKnown: WellKnown? = null
+        @Json(name = "well_known") val discoveryInformation: DiscoveryInformation? = null
 )
 
 internal fun Credentials.sessionId(): String {

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/DiscoveryInformation.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.matrix.android.api.auth.data
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+/**
+ * This is a light version of Wellknown model, used for login response
+ * Ref: https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-login
+ */
+@JsonClass(generateAdapter = true)
+data class DiscoveryInformation(
+        /**
+         * Required. Used by clients to discover homeserver information.
+         */
+        @Json(name = "m.homeserver")
+        val homeServer: WellKnownBaseConfig? = null,
+
+        /**
+         * Used by clients to discover identity server information.
+         * Note: matrix.org does not send this field
+         */
+        @Json(name = "m.identity_server")
+        val identityServer: WellKnownBaseConfig? = null
+)

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/SessionCreator.kt

@@ -46,14 +46,14 @@ internal class DefaultSessionCreator @Inject constructor(
         val sessionParams = SessionParams(
                 credentials = credentials,
                 homeServerConnectionConfig = homeServerConnectionConfig.copy(
-                        homeServerUri = credentials.wellKnown?.homeServer?.baseURL
+                        homeServerUri = credentials.discoveryInformation?.homeServer?.baseURL
                                 // remove trailing "/"
                                 ?.trim { it == '/' }
                                 ?.takeIf { it.isNotBlank() }
                                 ?.also { Timber.d("Overriding homeserver url to $it") }
                                 ?.let { Uri.parse(it) }
                                 ?: homeServerConnectionConfig.homeServerUri,
-                        identityServerUri = credentials.wellKnown?.identityServer?.baseURL
+                        identityServerUri = credentials.discoveryInformation?.identityServer?.baseURL
                                 // remove trailing "/"
                                 ?.trim { it == '/' }
                                 ?.takeIf { it.isNotBlank() }