diff --git a/atst/domain/task_orders.py b/atst/domain/task_orders.py
index 3aa5ba88..63239679 100644
--- a/atst/domain/task_orders.py
+++ b/atst/domain/task_orders.py
@@ -185,17 +185,6 @@ class TaskOrders(object):
                 "{} is not an officer role on task orders".format(officer_type)
             )
 
-    @classmethod
-    def is_officer_for_to(cls, task_order, user):
-        if (
-            user == task_order.contracting_officer
-            or user == task_order.contracting_officer_representative
-            or user == task_order.security_officer
-        ):
-            return True
-        else:
-            return False
-
     @classmethod
     def add_dd_254(user, task_order, dd_254_data):
         dd_254 = DD254(**dd_254_data)
diff --git a/atst/routes/portfolios/invitations.py b/atst/routes/portfolios/invitations.py
index d2d992b8..269ca21d 100644
--- a/atst/routes/portfolios/invitations.py
+++ b/atst/routes/portfolios/invitations.py
@@ -3,7 +3,6 @@ from flask import g, redirect, url_for, render_template
 from . import portfolios_bp
 from atst.domain.portfolios import Portfolios
 from atst.domain.invitations import Invitations
-from atst.domain.task_orders import TaskOrders
 from atst.queue import queue
 from atst.utils.flash import formatted_flash as flash
 
@@ -27,7 +26,7 @@ def accept_invitation(token):
     #   - the logged-in user has multiple roles on the TO (e.g., KO and COR)
     #   - the logged-in user has officer roles on multiple unsigned TOs
     for task_order in invite.portfolio.task_orders:
-        if TaskOrders.is_officer_for_to(task_order, g.current_user):
+        if g.current_user in task_order.officers:
             return redirect(
                 url_for(
                     "portfolios.view_task_order",