diff --git a/backend/atlas_portal/provisioning.py b/backend/atlas_portal/provisioning.py
index f3cd994..4c740c8 100644
--- a/backend/atlas_portal/provisioning.py
+++ b/backend/atlas_portal/provisioning.py
@@ -491,6 +491,13 @@ def provision_access_request(request_code: str) -> ProvisionResult:
                     pass
 
                 result = invite_user(vaultwarden_email)
+                if not result.ok and result.status == "error":
+                    fallback_email = contact_email.strip()
+                    if fallback_email and fallback_email != vaultwarden_email:
+                        fallback_result = invite_user(fallback_email)
+                        if fallback_result.ok:
+                            vaultwarden_email = fallback_email
+                            result = fallback_result
                 if result.ok:
                     _upsert_task(conn, request_code, "vaultwarden_invite", "ok", result.status)
                 else: