diff --git a/tools/walletextension/httpapi/utils.go b/tools/walletextension/httpapi/utils.go
index 80c58ba0cb..c7acc16b8c 100644
--- a/tools/walletextension/httpapi/utils.go
+++ b/tools/walletextension/httpapi/utils.go
@@ -26,7 +26,7 @@ func getUserID(conn UserConn) ([]byte, error) {
 	userID, err := getQueryParameter(conn.ReadRequestParams(), common.EncryptedTokenQueryParameter)
 	if err == nil {
 		if len(userID) != common.MessageUserIDLenWithPrefix {
-			return nil, fmt.Errorf(fmt.Sprintf("wrong length of userID from URL. Got: %d, Expected: %d", len(userID), common.MessageUserIDLen))
+			return nil, fmt.Errorf(fmt.Sprintf("wrong length of userID from URL. Got: %d, Expected: %d", len(userID), common.MessageUserIDLenWithPrefix))
 		}
 		return hexutils.HexToBytes(userID[2:]), err
 	}
diff --git a/tools/walletextension/lib/client_lib.go b/tools/walletextension/lib/client_lib.go
index 3e63a1a22e..72eda7b77c 100644
--- a/tools/walletextension/lib/client_lib.go
+++ b/tools/walletextension/lib/client_lib.go
@@ -74,7 +74,7 @@ func (o *TGLib) RegisterAccount(pk *ecdsa.PrivateKey, addr gethcommon.Address) e
 	req, err := http.NewRequestWithContext(
 		context.Background(),
 		http.MethodPost,
-		o.httpURL+"/v1/authenticate/?token="+hexutils.BytesToHex(o.userID),
+		o.httpURL+"/v1/authenticate/?token=0x"+hexutils.BytesToHex(o.userID),
 		strings.NewReader(payload),
 	)
 	if err != nil {
@@ -124,7 +124,7 @@ func (o *TGLib) RegisterAccountPersonalSign(pk *ecdsa.PrivateKey, addr gethcommo
 	req, err := http.NewRequestWithContext(
 		context.Background(),
 		http.MethodPost,
-		o.httpURL+"/v1/authenticate/?token="+hexutils.BytesToHex(o.userID),
+		o.httpURL+"/v1/authenticate/?token=0x"+hexutils.BytesToHex(o.userID),
 		strings.NewReader(payload),
 	)
 	if err != nil {