diff --git a/containers/backupchecks/src/backend/app/changelog.py b/containers/backupchecks/src/backend/app/changelog.py
index a68b035..d9e12eb 100644
--- a/containers/backupchecks/src/backend/app/changelog.py
+++ b/containers/backupchecks/src/backend/app/changelog.py
@@ -3,6 +3,21 @@ Changelog data structure for Backupchecks
 """
 
 CHANGELOG = [
+    {
+        "version": "v0.2.4",
+        "date": "2026-03-26",
+        "summary": "Hotfix release that restores support for linking existing umbrella/shared Autotask tickets across companies from Run Checks.",
+        "sections": [
+            {
+                "title": "Fixed",
+                "type": "bugfix",
+                "changes": [
+                    "Run Checks Link existing Autotask ticket no longer blocks cross-company tickets when the selected ticket company differs from the mapped customer company",
+                    "Umbrella/shared Autotask tickets can be linked again while existing safeguards remain: ticket must exist, include a ticket number, and not be terminal/completed"
+                ]
+            }
+        ]
+    },
     {
         "version": "v0.2.3",
         "date": "2026-03-23",
diff --git a/containers/backupchecks/src/backend/app/main/routes_run_checks.py b/containers/backupchecks/src/backend/app/main/routes_run_checks.py
index 315446f..a532c31 100644
--- a/containers/backupchecks/src/backend/app/main/routes_run_checks.py
+++ b/containers/backupchecks/src/backend/app/main/routes_run_checks.py
@@ -2240,15 +2240,13 @@ def api_run_checks_autotask_link_existing_ticket():
     if not isinstance(t, dict):
         return jsonify({"status": "error", "message": "Autotask did not return a ticket object."}), 400
 
-    # Enforce company scope.
+    # Allow cross-company linking for shared/umbrella Autotask tickets.
+    # Keep parsed company id for diagnostics/audit context, but do not block on mismatch.
     try:
         t_company = int(t.get("companyID") or 0)
     except Exception:
         t_company = 0
 
-    if t_company != int(customer.autotask_company_id):
-        return jsonify({"status": "error", "message": "Selected ticket does not belong to the mapped Autotask company."}), 400
-
     tnum = (t.get("ticketNumber") or t.get("number") or "")
     tnum = str(tnum or "").strip()
     if not tnum:
diff --git a/containers/backupchecks/src/templates/main/run_checks.html b/containers/backupchecks/src/templates/main/run_checks.html
index dae5989..f726985 100644
--- a/containers/backupchecks/src/templates/main/run_checks.html
+++ b/containers/backupchecks/src/templates/main/run_checks.html
@@ -1513,6 +1513,7 @@ table.addEventListener('change', function (e) {
         if (mailPanel)   mailPanel.style.display  = '';
         if (bodyFrame)   bodyFrame.srcdoc = wrapMailHtml(run.body_html || '');
       } else {
+        if (modalEl) modalEl.classList.remove('is-cove');
         if (covePanel)   covePanel.style.display   = 'none';
         if (ccPanel)     ccPanel.style.display     = 'none';
         if (mailHeading) { mailHeading.style.display = ''; mailHeading.textContent = 'Mail'; }
diff --git a/docs/changelog-claude.md b/docs/changelog-claude.md
index 1e4a12b..b35c152 100644
--- a/docs/changelog-claude.md
+++ b/docs/changelog-claude.md
@@ -2,6 +2,14 @@
 
 This file documents all changes made to this project via Claude Code.
 
+## [2026-03-26]
+
+### Fixed
+- Run Checks modal mail visibility hotfix: normal mail runs now explicitly clear the `is-cove` modal class before rendering mail content, preventing intermittent hidden mail after navigating from a Cove run; Cove behavior itself remains unchanged.
+- Run Checks Autotask "Link existing ticket" now allows linking cross-company tickets (for shared/umbrella tickets that apply to multiple customers):
+  - Removed the hard company mismatch block in `POST /api/run-checks/autotask-link-existing-ticket` (`containers/backupchecks/src/backend/app/main/routes_run_checks.py`).
+  - Tickets are still validated for existence, ticket number presence, and non-terminal status before linking.
+
 ## [2026-03-23]
 
 ### Fixed
diff --git a/docs/changelog.md b/docs/changelog.md
index 023fc93..a9eca2e 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,3 +1,9 @@
+## v0.2.4
+
+### Fixed
+- **Autotask: link existing ticket cross-company hotfix** — removed the hard company mismatch block in the Run Checks endpoint that links existing Autotask tickets, so umbrella/shared tickets can be linked even when the ticket company differs from the mapped customer company.
+- Existing safeguards remain active: ticket must exist, must have a ticket number, and may not be in a terminal/completed status.
+
 ## v0.2.3
 
 ### Added