diff --git a/src/app/git/components/providers/GithubProviderModal.tsx b/src/app/git/components/providers/GithubProviderModal.tsx
index 36e4c56..112ebd7 100644
--- a/src/app/git/components/providers/GithubProviderModal.tsx
+++ b/src/app/git/components/providers/GithubProviderModal.tsx
@@ -5,7 +5,6 @@ import {
 } from "@/app/settings/components/SettingsPrimitives";
 import {
   type GithubProviderModalProps,
-  ProviderBadge,
   getProviderMeta,
   launchGithubManifestFlow,
 } from "./git-provider-shared";
@@ -117,7 +116,19 @@ export default function GithubProviderModal({
               placeholder="Organization name"
             />
           </div>
-        ) : null}
+        ) : (
+          <div>
+            <FieldLabel>GitHub Username</FieldLabel>
+            <input
+              className="input"
+              value={draft.accountUsername}
+              onChange={(event) =>
+                updateDraft("accountUsername", event.target.value)
+              }
+              placeholder="Your GitHub username"
+            />
+          </div>
+        )}
 
         <div
           style={{
@@ -191,7 +202,7 @@ export default function GithubProviderModal({
               className="input"
               value={draft.appName}
               onChange={(event) => updateDraft("appName", event.target.value)}
-              placeholder={`Doktainer-${new Date().toISOString().split("T")[0].replace(/-/g, "")}-${Math.random().toString(36).slice(2, 10)}`}
+              placeholder="Doktainer-20260718-ab12cd34"
             />
           </div>
 
diff --git a/src/app/git/components/providers/GitlabProviderModal.tsx b/src/app/git/components/providers/GitlabProviderModal.tsx
index edb1a81..fdafd51 100644
--- a/src/app/git/components/providers/GitlabProviderModal.tsx
+++ b/src/app/git/components/providers/GitlabProviderModal.tsx
@@ -2,7 +2,6 @@ import { ExternalLink } from "lucide-react";
 import { FieldLabel } from "@/app/settings/components/SettingsPrimitives";
 import {
   type GitProviderModalBaseProps,
-  ProviderBadge,
   getProviderMeta,
 } from "./git-provider-shared";
 import { markGitProviderCallbackIntent } from "@/lib/git-provider-callback-intent";
@@ -193,6 +192,18 @@ export default function GitlabProviderModal({
             placeholder="my-org"
           />
         </div>
+
+        <div style={{ gridColumn: "1 / -1" }}>
+          <FieldLabel>GitLab Username (Required Without Group)</FieldLabel>
+          <input
+            className="input"
+            value={draft.accountUsername}
+            onChange={(event) =>
+              updateDraft("accountUsername", event.target.value)
+            }
+            placeholder="Your GitLab username"
+          />
+        </div>
       </section>
     </>
   );
diff --git a/src/server/routes/git-providers.ts b/src/server/routes/git-providers.ts
index fa9bbc1..4029c4b 100644
--- a/src/server/routes/git-providers.ts
+++ b/src/server/routes/git-providers.ts
@@ -1,7 +1,7 @@
 import { FastifyInstance } from "fastify";
 import { z } from "zod";
 import prisma from "../lib/prisma";
-import { decrypt, encrypt } from "../lib/crypto";
+import { encrypt } from "../lib/crypto";
 import { authenticate, requireRole } from "../middleware/auth";
 import { auditLog } from "../services/audit.service";
 import { verifyGitProviderConfiguration } from "../services/integration-verification.service";
@@ -170,6 +170,18 @@ function getProviderOwner(provider: GitProviderRecord) {
   );
 }
 
+function getGithubInstallationTargetId(installationUrl?: string | null) {
+  const rawUrl = toTrimmedValue(installationUrl);
+  if (!rawUrl) return "";
+
+  try {
+    const targetId = new URL(rawUrl).searchParams.get("target_id")?.trim();
+    return targetId && /^\d+$/.test(targetId) ? targetId : "";
+  } catch {
+    return "";
+  }
+}
+
 function buildProviderFetchErrorMessage(args: {
   provider: GitProviderRecord["provider"];
   resource: string;
@@ -247,6 +259,32 @@ async function fetchJson(
   return json;
 }
 
+async function resolveProviderOwner(provider: GitProviderRecord) {
+  const configuredOwner = getProviderOwner(provider);
+  if (configuredOwner || provider.provider !== "GITHUB") {
+    return configuredOwner;
+  }
+
+  // GitHub's manifest flow stores the installation target account ID in the
+  // installation URL. Older personal-account records did not persist a
+  // username, so resolve the public login from that stable account ID.
+  const targetId = getGithubInstallationTargetId(provider.installationUrl);
+  if (!targetId) return "";
+
+  const baseUrl = normalizeBaseUrl(provider.providerUrl, "https://github.com");
+  const apiBase =
+    baseUrl.toLowerCase() === "https://github.com"
+      ? "https://api.github.com"
+      : `${baseUrl}/api/v3`;
+  const payload = await fetchJson(`${apiBase}/user/${targetId}`, {
+    provider: provider.provider,
+    resource: "GitHub account",
+  });
+
+  if (!payload || typeof payload !== "object") return "";
+  return toTrimmedValue((payload as { login?: string }).login);
+}
+
 function mapGithubRepositories(payload: unknown): GitProviderRepository[] {
   if (!Array.isArray(payload)) return [];
 
@@ -468,7 +506,7 @@ function mapGiteaBranches(
 async function listRepositoriesForProvider(
   provider: GitProviderRecord,
 ): Promise<GitProviderRepository[]> {
-  const owner = getProviderOwner(provider);
+  const owner = await resolveProviderOwner(provider);
   if (!owner) {
     throw new Error(
       "Configure namespace, organization name, or account username on the Git provider before loading repositories",