diff --git a/app/account_linking.py b/app/account_linking.py
index 7262ff31..72e6fbd0 100644
--- a/app/account_linking.py
+++ b/app/account_linking.py
@@ -9,17 +9,16 @@ from newrelic import agent
 from psycopg2.errors import UniqueViolation
 from sqlalchemy import or_
 
+from app import config
 from app.db import Session
 from app.email_utils import send_welcome_email
-from app.events.event_dispatcher import EventDispatcher
-from app.events.generated.event_pb2 import UserPlanChanged, EventContent
-from app.partner_user_utils import create_partner_user, create_partner_subscription
-from app.utils import sanitize_email, canonicalize_email
 from app.errors import (
     AccountAlreadyLinkedToAnotherPartnerException,
     AccountIsUsingAliasAsEmail,
     AccountAlreadyLinkedToAnotherUserException,
 )
+from app.events.event_dispatcher import EventDispatcher
+from app.events.generated.event_pb2 import UserPlanChanged, EventContent
 from app.log import LOG
 from app.models import (
     PartnerSubscription,
@@ -28,8 +27,10 @@ from app.models import (
     User,
     Alias,
 )
+from app.partner_user_utils import create_partner_user, create_partner_subscription
 from app.user_audit_log_utils import emit_user_audit_log, UserAuditLogAction
 from app.utils import random_string
+from app.utils import sanitize_email, canonicalize_email
 
 
 class SLPlanType(Enum):
@@ -337,6 +338,11 @@ def link_user(
 def switch_already_linked_user(
     link_request: PartnerLinkRequest, partner_user: PartnerUser, current_user: User
 ):
+    if config.PROTON_PREVENT_CHANGE_LINKED_ACCOUNT:
+        LOG.i(
+            f"Proton account is linked to another user partner_user:{partner_user.id} from user:{current_user.id}"
+        )
+        raise AccountAlreadyLinkedToAnotherUserException()
     # Find if the user has another link and unlink it
     other_partner_user = PartnerUser.get_by(
         user_id=current_user.id,
@@ -346,7 +352,6 @@ def switch_already_linked_user(
         LOG.i(
             f"Deleting previous partner_user:{other_partner_user.id} from user:{current_user.id}"
         )
-
         emit_user_audit_log(
             user=other_partner_user.user,
             action=UserAuditLogAction.UnlinkAccount,
diff --git a/app/auth/views/activate.py b/app/auth/views/activate.py
index 885319a2..47fc505a 100644
--- a/app/auth/views/activate.py
+++ b/app/auth/views/activate.py
@@ -8,7 +8,6 @@ from app.extensions import limiter
 from app.log import LOG
 from app.models import ActivationCode
 from app.user_audit_log_utils import emit_user_audit_log, UserAuditLogAction
-from app.utils import sanitize_next_url
 
 
 @auth_bp.route("/activate", methods=["GET", "POST"])
@@ -64,12 +63,5 @@ def activate():
     email_utils.send_welcome_email(user)
 
     # The activation link contains the original page, for ex authorize page
-    if "next" in request.args:
-        next_url = sanitize_next_url(request.args.get("next"))
-        LOG.d("redirect user to %s", next_url)
-        return redirect(next_url)
-    else:
-        LOG.d("redirect user to dashboard")
-        return redirect(url_for("dashboard.index"))
-        # todo: redirect to account_activated page when more features are added into the browser extension
-        # return redirect(url_for("onboarding.account_activated"))
+    LOG.d("redirect user to dashboard")
+    return redirect(url_for("dashboard.index"))
diff --git a/app/config.py b/app/config.py
index 0671c779..c3636593 100644
--- a/app/config.py
+++ b/app/config.py
@@ -303,6 +303,9 @@ PROTON_BASE_URL = os.environ.get(
     "PROTON_BASE_URL", "https://account.protonmail.com/api"
 )
 PROTON_VALIDATE_CERTS = "PROTON_VALIDATE_CERTS" in os.environ
+PROTON_PREVENT_CHANGE_LINKED_ACCOUNT = (
+    "PROTON_PREVENT_CHANGE_LINKED_ACCOUNT" in os.environ
+)
 CONNECT_WITH_PROTON = "CONNECT_WITH_PROTON" in os.environ
 PROTON_EXTRA_HEADER_NAME = os.environ.get("PROTON_EXTRA_HEADER_NAME")
 PROTON_EXTRA_HEADER_VALUE = os.environ.get("PROTON_EXTRA_HEADER_VALUE")