diff --git a/app/assets/javascripts/admin/addon/controllers/admin-user-index.js b/app/assets/javascripts/admin/addon/controllers/admin-user-index.js
index c11df41a5f9..807bb399325 100644
--- a/app/assets/javascripts/admin/addon/controllers/admin-user-index.js
+++ b/app/assets/javascripts/admin/addon/controllers/admin-user-index.js
@@ -222,11 +222,6 @@ export default Controller.extend(CanCheckEmails, {
         .then((result) => {
           if (result.email_confirmation_required) {
             bootbox.alert(I18n.t("admin.user.grant_admin_confirm"));
-          } else {
-            const controller = showModal("grant-admin-second-factor", {
-              model: this.model,
-            });
-            controller.setResult(result);
           }
         })
         .catch((error) => {
diff --git a/app/assets/javascripts/discourse/app/controllers/grant-admin-second-factor.js b/app/assets/javascripts/discourse/app/controllers/grant-admin-second-factor.js
deleted file mode 100644
index 62c000b4731..00000000000
--- a/app/assets/javascripts/discourse/app/controllers/grant-admin-second-factor.js
+++ /dev/null
@@ -1,84 +0,0 @@
-import Controller from "@ember/controller";
-import { action } from "@ember/object";
-import discourseComputed from "discourse-common/utils/decorators";
-import { getWebauthnCredential } from "discourse/lib/webauthn";
-import ModalFunctionality from "discourse/mixins/modal-functionality";
-import { SECOND_FACTOR_METHODS } from "discourse/models/user";
-import I18n from "I18n";
-import bootbox from "bootbox";
-
-export default Controller.extend(ModalFunctionality, {
-  showSecondFactor: false,
-  secondFactorMethod: SECOND_FACTOR_METHODS.TOTP,
-  secondFactorToken: null,
-  securityKeyCredential: null,
-
-  inProgress: false,
-
-  onShow() {
-    this.setProperties({
-      showSecondFactor: false,
-      secondFactorMethod: SECOND_FACTOR_METHODS.TOTP,
-      secondFactorToken: null,
-      securityKeyCredential: null,
-    });
-  },
-
-  @discourseComputed("inProgress", "securityKeyCredential", "secondFactorToken")
-  disabled(inProgress, securityKeyCredential, secondFactorToken) {
-    return inProgress || (!securityKeyCredential && !secondFactorToken);
-  },
-
-  setResult(result) {
-    this.setProperties({
-      otherMethodAllowed: result.multiple_second_factor_methods,
-      secondFactorRequired: true,
-      showLoginButtons: false,
-      backupEnabled: result.backup_enabled,
-      showSecondFactor: result.totp_enabled,
-      showSecurityKey: result.security_key_enabled,
-      secondFactorMethod: result.security_key_enabled
-        ? SECOND_FACTOR_METHODS.SECURITY_KEY
-        : SECOND_FACTOR_METHODS.TOTP,
-      securityKeyChallenge: result.challenge,
-      securityKeyAllowedCredentialIds: result.allowed_credential_ids,
-    });
-  },
-
-  @action
-  authenticateSecurityKey() {
-    getWebauthnCredential(
-      this.securityKeyChallenge,
-      this.securityKeyAllowedCredentialIds,
-      (credentialData) => {
-        this.set("securityKeyCredential", credentialData);
-        this.send("authenticate");
-      },
-      (errorMessage) => {
-        this.flash(errorMessage, "error");
-      }
-    );
-  },
-
-  @action
-  authenticate() {
-    this.set("inProgress", true);
-    this.model
-      .grantAdmin({
-        second_factor_token:
-          this.securityKeyCredential || this.secondFactorToken,
-        second_factor_method: this.secondFactorMethod,
-        timezone: moment.tz.guess(),
-      })
-      .then((result) => {
-        if (result.success) {
-          this.send("closeModal");
-          bootbox.alert(I18n.t("admin.user.grant_admin_success"));
-        } else {
-          this.flash(result.error, "error");
-          this.setResult(result);
-        }
-      })
-      .finally(() => this.set("inProgress", false));
-  },
-});
diff --git a/app/assets/javascripts/discourse/app/templates/modal/grant-admin-second-factor.hbs b/app/assets/javascripts/discourse/app/templates/modal/grant-admin-second-factor.hbs
deleted file mode 100644
index 3c49f73034c..00000000000
--- a/app/assets/javascripts/discourse/app/templates/modal/grant-admin-second-factor.hbs
+++ /dev/null
@@ -1,33 +0,0 @@
-{{#d-modal-body title="admin.user.grant_admin"}}
-  {{#second-factor-form
-    secondFactorMethod=secondFactorMethod
-    secondFactorToken=secondFactorToken
-    class=secondFactorClass
-    backupEnabled=backupEnabled
-  }}
-    {{#if showSecurityKey}}
-      {{#security-key-form
-        allowedCredentialIds=securityKeyAllowedCredentialIds
-        challenge=securityKeyChallenge
-        showSecurityKey=showSecurityKey
-        showSecondFactor=showSecondFactor
-        secondFactorMethod=secondFactorMethod
-        otherMethodAllowed=otherMethodAllowed
-        action=(action "authenticateSecurityKey")}}
-      {{/security-key-form}}
-    {{else}}
-      {{second-factor-input value=secondFactorToken inputId="second-factor-confirmation" secondFactorMethod=secondFactorMethod backupEnabled=backupEnabled}}
-    {{/if}}
-  {{/second-factor-form}}
-
-  {{#unless showSecurityKey}}
-    <div class="modal-footer">
-      {{d-button
-        action=(action "authenticate")
-        icon="shield-alt"
-        label="admin.user.grant_admin"
-        disabled=disabled
-        class="btn btn-primary"}}
-    </div>
-  {{/unless}}
-{{/d-modal-body}}
diff --git a/app/assets/javascripts/discourse/tests/acceptance/admin-user-index-test.js b/app/assets/javascripts/discourse/tests/acceptance/admin-user-index-test.js
index bb766e5ca80..e355b3c17f4 100644
--- a/app/assets/javascripts/discourse/tests/acceptance/admin-user-index-test.js
+++ b/app/assets/javascripts/discourse/tests/acceptance/admin-user-index-test.js
@@ -8,7 +8,9 @@ import { click, currentURL, fillIn, visit } from "@ember/test-helpers";
 import selectKit from "discourse/tests/helpers/select-kit-helper";
 import { test } from "qunit";
 import I18n from "I18n";
+import { SECOND_FACTOR_METHODS } from "discourse/models/user";
 
+const { TOTP, BACKUP_CODE, SECURITY_KEY } = SECOND_FACTOR_METHODS;
 acceptance("Admin - User Index", function (needs) {
   needs.user();
   needs.pretender((server, helper) => {
@@ -83,17 +85,17 @@ acceptance("Admin - User Index", function (needs) {
     });
 
     server.put("/admin/users/4/grant_admin", () => {
-      return helper.response({
-        failed: "FAILED",
-        ok: false,
-        error: "The selected two-factor method is invalid.",
-        reason: "invalid_second_factor_method",
-        backup_enabled: true,
-        security_key_enabled: true,
+      return helper.response(403, {
+        second_factor_challenge_nonce: "somenonce",
+      });
+    });
+
+    server.get("/session/2fa.json", () => {
+      return helper.response(200, {
         totp_enabled: true,
-        multiple_second_factor_methods: true,
-        allowed_credential_ids: ["allowed_credential_ids"],
-        challenge: "challenge",
+        backup_enabled: true,
+        security_keys_enabled: true,
+        allowed_methods: [TOTP, BACKUP_CODE, SECURITY_KEY],
       });
     });
   });
@@ -202,9 +204,13 @@ acceptance("Admin - User Index", function (needs) {
     await click(".bootbox .btn-primary");
   });
 
-  test("grant admin - shows the second factor modal", async function (assert) {
+  test("grant admin - redirects to the 2fa page", async function (assert) {
     await visit("/admin/users/4/user2");
     await click(".grant-admin");
-    assert.ok(exists(".grant-admin-second-factor-modal"));
+    assert.equal(
+      currentURL(),
+      "/session/2fa?nonce=somenonce",
+      "user is redirected to the 2FA page"
+    );
   });
 });