diff --git a/edc_consent/form_validators/consent_definition_form_validator_mixin.py b/edc_consent/form_validators/consent_definition_form_validator_mixin.py
index c4efa11..25dad18 100644
--- a/edc_consent/form_validators/consent_definition_form_validator_mixin.py
+++ b/edc_consent/form_validators/consent_definition_form_validator_mixin.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from datetime import datetime
+from typing import TYPE_CHECKING
 
 from django.utils.translation import gettext as _
 from edc_form_validators import INVALID_ERROR
@@ -15,6 +16,9 @@
 )
 from edc_consent.site_consents import site_consents
 
+if TYPE_CHECKING:
+    from django.contrib.sites.models import Site
+
 
 class ConsentDefinitionFormValidatorMixin:
 
@@ -24,17 +28,22 @@ def subject_consent(self):
         return cdef.model_cls.objects.get(subject_identifier=self.subject_identifier)
 
     def get_consent_datetime_or_raise(
-        self, report_datetime: datetime = None, fldname: str = None, error_code: str = None
+        self,
+        report_datetime: datetime = None,
+        site: Site = None,
+        fldname: str = None,
+        error_code: str = None,
     ) -> datetime:
         """Returns the consent_datetime of this subject"""
         consent_obj = self.get_consent_or_raise(
-            report_datetime=report_datetime, fldname=fldname, error_code=error_code
+            report_datetime=report_datetime, site=site, fldname=fldname, error_code=error_code
         )
         return consent_obj.consent_datetime
 
     def get_consent_or_raise(
         self,
         report_datetime: datetime = None,
+        site: Site = None,
         fldname: str | None = None,
         error_code: str | None = None,
     ) -> datetime:
@@ -48,7 +57,9 @@ def get_consent_or_raise(
         error_code = error_code or INVALID_ERROR
         try:
             consent_obj = site_consents.get_consent_or_raise(
-                subject_identifier=self.subject_identifier, report_datetime=report_datetime
+                subject_identifier=self.subject_identifier,
+                report_datetime=report_datetime,
+                site_id=getattr(site, "id", None),
             )
         except (NotConsentedError, ConsentDefinitionNotConfiguredForUpdate) as e:
             self.raise_validation_error({fldname: str(e)}, error_code)
diff --git a/edc_consent/modelform_mixins/requires_consent_modelform_mixin.py b/edc_consent/modelform_mixins/requires_consent_modelform_mixin.py
index 3c96722..e54f4b6 100644
--- a/edc_consent/modelform_mixins/requires_consent_modelform_mixin.py
+++ b/edc_consent/modelform_mixins/requires_consent_modelform_mixin.py
@@ -42,6 +42,7 @@ def validate_against_consent(self) -> None:
                 consent_obj = site_consents.get_consent_or_raise(
                     subject_identifier=self.get_subject_identifier(),
                     report_datetime=self.report_datetime,
+                    site_id=self.site.id,
                 )
             except (NotConsentedError, ConsentDefinitionNotConfiguredForUpdate) as e:
                 raise forms.ValidationError({"__all__": str(e)})
diff --git a/edc_consent/site_consents.py b/edc_consent/site_consents.py
index 166e553..ca58108 100644
--- a/edc_consent/site_consents.py
+++ b/edc_consent/site_consents.py
@@ -168,17 +168,19 @@ def get_consent_definition(
 
         Filters the registry by each param given.
         """
-        cdefs = self.get_consent_definitions(
+        opts = dict(
             model=model,
             report_datetime=report_datetime,
             version=version,
             site=site,
             screening_model=screening_model,
-            **kwargs,
         )
+        cdefs = self.get_consent_definitions(**opts, **kwargs)
         if len(cdefs) > 1:
             as_string = ", ".join(list(set([cdef.name for cdef in cdefs])))
-            raise SiteConsentError(f"Multiple consent definitions returned. Got {as_string}. ")
+            raise SiteConsentError(
+                f"Multiple consent definitions returned. Using {opts}. Got {as_string}. "
+            )
         return cdefs[0]
 
     def get_consent_definitions(