How should I redirect to newsletter confirmation page after form submit in react?

Question

After submitting the form the external link to the newsletter confirmation page should open and it working as expected in local but in production, it is redirecting to siteUrl/undefined

<form
        action={`${revueConfigValue}`}
        method="post"
        id="revue-form"
        name="revue-form"
        target="_blank"
      >
        <Flex gap={2} justifyContent={"center"} alignItems={"center"}>
          <Box>
            <Input
              width={"100%"}
              variant={"solid"}
              borderWidth={1}
              color={"gray.800"}
              _placeholder={{
                color: "gray.400",
              }}
              borderColor={useColorModeValue("gray.300", "gray.700")}
              id="member_email"
              name="member[email]"
              type={"email"}
              required
              placeholder={"Your Email"}
              aria-label={"Your Email"}
              value={email}
              onChange={(e: ChangeEvent<HTMLInputElement>) =>
                setEmail(e.target.value)
              }
            />
          </Box>
          <Box>
            <Button
              type="submit"
              value="Subscribe"
              name="member[subscribe]"
              id="member_submit"
            >
              Submit
            </Button>
          </Box>
        </Flex>
      </form>

It can be something silly I might be missing or silly, I don't know and couldn't find any solution for searching for a while any help would be appreciated! In am using revue newsletter if that matters.