diff --git a/tests/nexus/test_1_4_DNS_TC_1.cpp b/tests/nexus/test_1_4_DNS_TC_1.cpp
index 7956cbfa4..d888840ba 100644
--- a/tests/nexus/test_1_4_DNS_TC_1.cpp
+++ b/tests/nexus/test_1_4_DNS_TC_1.cpp
@@ -158,7 +158,7 @@ void Test_1_4_DNS_TC_1(const char *aJsonFileName)
     r1.Join(br1);
     nexus.AdvanceTime(kJoinNetworkTime);
 
-    ed1.Join(r1);
+    ed1.Join(r1, Node::kAsFed);
     nexus.AdvanceTime(kJoinNetworkTime);
 
     // Setup BR_1 as Border Router
diff --git a/tests/nexus/test_1_4_DNS_TC_5.cpp b/tests/nexus/test_1_4_DNS_TC_5.cpp
index 0477f1a90..aa971d065 100644
--- a/tests/nexus/test_1_4_DNS_TC_5.cpp
+++ b/tests/nexus/test_1_4_DNS_TC_5.cpp
@@ -287,7 +287,7 @@ void Test_1_4_DNS_TC_5(const char *aJsonFileName)
     br1.Form();
     nexus.AdvanceTime(kFormNetworkTime);
 
-    ed1.Join(br1);
+    ed1.Join(br1, Node::kAsFed);
     nexus.AdvanceTime(kJoinNetworkTime);
 
     br1.Get<BorderRouter::InfraIf>().Init(1, true);
diff --git a/tests/nexus/test_1_4_PIC_TC_1.cpp b/tests/nexus/test_1_4_PIC_TC_1.cpp
index 9b6cea0f8..c570dd45c 100644
--- a/tests/nexus/test_1_4_PIC_TC_1.cpp
+++ b/tests/nexus/test_1_4_PIC_TC_1.cpp
@@ -349,7 +349,7 @@ void Test_1_4_PIC_TC_1(void)
     r1.Join(br1);
     nexus.AdvanceTime(kJoinNetworkTime);
 
-    ed1.Join(r1);
+    ed1.Join(r1, Node::kAsFed);
     nexus.AdvanceTime(kJoinNetworkTime);
 
     Log("Step 4: BR_1 obtains OMR prefix via DHCPv6-PD");
diff --git a/tests/nexus/test_1_4_PIC_TC_3.cpp b/tests/nexus/test_1_4_PIC_TC_3.cpp
index e5e088159..f362017c2 100644
--- a/tests/nexus/test_1_4_PIC_TC_3.cpp
+++ b/tests/nexus/test_1_4_PIC_TC_3.cpp
@@ -308,7 +308,7 @@ void Test_1_4_PIC_TC_3(void)
     r1.Join(br1);
     nexus.AdvanceTime(kJoinNetworkTime);
 
-    ed1.Join(r1);
+    ed1.Join(r1, Node::kAsFed);
     nexus.AdvanceTime(kJoinNetworkTime);
 
     Log("Step 4: BR_1 obtains OMR prefix via DHCPv6-PD");
diff --git a/tests/nexus/test_1_4_PIC_TC_4.cpp b/tests/nexus/test_1_4_PIC_TC_4.cpp
index f3a9fbd6d..2575e8ee6 100644
--- a/tests/nexus/test_1_4_PIC_TC_4.cpp
+++ b/tests/nexus/test_1_4_PIC_TC_4.cpp
@@ -253,7 +253,7 @@ void Test_1_4_PIC_TC_4(void)
     r1.Join(br1);
     nexus.AdvanceTime(kJoinNetworkTime);
 
-    ed1.Join(r1);
+    ed1.Join(r1, Node::kAsFed);
     nexus.AdvanceTime(kJoinNetworkTime);
 
     Log("Step 4: BR_1 configures IPv4 address and NAT64 prefix");