update routes

app/javascript/submission_form/phone_step.vue

@@ -285,7 +285,7 @@ export default {
       }, 1000)
     },
     sendVerificationCode () {
-      return fetch(this.baseUrl + '/api/send_phone_verification_code', {
+      const options = {
         method: 'POST',
         body: JSON.stringify({
           submitter_slug: this.submitterSlug,
@@ -293,6 +293,14 @@ export default {
           phone: this.fullInternationalPhoneValue
         }),
         headers: { 'Content-Type': 'application/json' }
+      }
+
+      return fetch(this.baseUrl + `/s/${this.submitterSlug}/send_phone_verification_code`, options).then((resp) => {
+        if (resp.status === 404) {
+          return fetch(this.baseUrl + '/api/send_phone_verification_code', options)
+        } else {
+          return resp
+        }
       }).then(async (resp) => {
         if ([422, 429].includes(resp.status)) {
           const data = await resp.json()