diff --git a/ctms/acoustic_service.py b/ctms/acoustic_service.py
index 4a1ad680..5e3c3664 100644
--- a/ctms/acoustic_service.py
+++ b/ctms/acoustic_service.py
@@ -259,8 +259,10 @@ def _main_table_converter(self, contact, main_fields):
                             )
                         # TODO: These are boolean values on our models, but in Acoustic
                         # they are configured as text values where we record `True`
-                        # and `False` as `1` and `0` respectively. We should
-                        # configure Acoustic to use a boolean column for this data.
+                        # and `False` as `1` and `0` respectively.
+                        # Note that `amo_*` and `fxa_*` fields are omitted when contact does not
+                        # have these relations.
+                        # We should configure Acoustic to use a boolean column for this data.
                         # This is being tracked in https://github.com/mozilla-it/ctms-api/issues/803
                         if acoustic_field_name in (
                             "double_opt_in",
diff --git a/tests/unit/test_acoustic_service.py b/tests/unit/test_acoustic_service.py
index 21f53d7e..308087fc 100644
--- a/tests/unit/test_acoustic_service.py
+++ b/tests/unit/test_acoustic_service.py
@@ -81,7 +81,10 @@ def test_ctms_to_acoustic_no_product(
         assert len(products) == 0, f"{i + 1}/3: no products in contact."
 
 
-@pytest.mark.parametrize("model_value,acoustic_value", [(False, "0"), (True, "1")])
+@pytest.mark.parametrize(
+    "model_value,acoustic_value,with_relations",
+    [(False, "0", True), (True, "1", True), (False, "0", False), (True, "1", False)],
+)
 def test_ctms_to_acoustic_special_booleans(
     dbsession,
     base_ctms_acoustic_service,
@@ -91,15 +94,17 @@ def test_ctms_to_acoustic_special_booleans(
     acoustic_newsletters_mapping,
     model_value,
     acoustic_value,
+    with_relations,
 ):
     email = email_factory(
         double_opt_in=model_value,
         has_opted_out_of_email=model_value,
-        fxa=True,
-        amo=True,
-        amo__email_opt_in=model_value,
-        fxa__account_deleted=model_value,
+        fxa=with_relations,
+        amo=with_relations,
     )
+    if with_relations:
+        email.amo.email_opt_in = model_value
+        email.fxa.account_deleted = model_value
     dbsession.commit()
 
     contact = ContactSchema.from_email(email)
@@ -113,8 +118,12 @@ def test_ctms_to_acoustic_special_booleans(
 
     assert main["double_opt_in"] == acoustic_value
     assert main["has_opted_out_of_email"] == acoustic_value
-    assert main["fxa_account_deleted"] == acoustic_value
-    assert main["amo_email_opt_in"] == acoustic_value
+    if with_relations:
+        assert main["fxa_account_deleted"] == acoustic_value
+        assert main["amo_email_opt_in"] == acoustic_value
+    else:
+        assert "fxa_account_deleted" not in main
+        assert "amo_email_opt_in" not in main
 
 
 def test_ctms_to_acoustic_newsletters(