[HELP] Xano Sign Up Action Fails: "Cannot GET /databases/.../sessions/external_login" on New App

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Problem

I created a NEW Adalo app using Xano as database, but the Sign Up action and the signup one fail consistently with:

Failed to load resource: the server responded with a status of 403 (Forbidden)
Failed to load resource: the server responded with a status of 500 (Internal Server Error)

AUTHENTICATE EXTERNAL ERROR!
Cannot GET /databases/[...]/sessions/external_login

What I’ve Tried

:white_check_mark: Xano API WORKS perfectly - tested /auth/signup endpoint directly with curl:

curl -X POST https://x8ki-letl-twmt.n7.xano.io/api:uqk7Yrjr/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"Email":"test@example.com","password":"password123","Full_Name":"Test User"}'

Response (SUCCESS):

{
  "authToken": "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiemlwIjoiREVGIn0...",
  "user_id": 114
}

:white_check_mark: Xano endpoints configured correctly:

  • /auth/signup - Returns authToken + user_id
  • /auth/me - Returns current user (works)
  • /auth/login - Configured and ready
  • All inputs match exactly (Email, password, Full_Name)

:white_check_mark: Adalo app setup:

  • Created BRAND NEW app → selected “Use Xano as my database” at creation
  • Business plan (Team+ required)
  • Connected Xano Base URL correctly
  • Users table imported successfully

:white_check_mark: Test credentials entered:

  • Email: hypocrite3@saoule.com
  • Password: •••••••••• (10+ chars)
  • Full Name: test fatigue2

Error Details (from Network Tab)

Request: POST to /auth/signup
Status: 403 Forbidden / 500 Internal Server Error
Response: AUTHENTICATE EXTERNAL ERROR!
Failed endpoint: Cannot GET /databases/e2b51fee9de04003b11f6e5e0c018c1a/sessions/external_login

This looks like an Adalo internal endpoint (/sessions/external_login) that’s failing, not a Xano issue.

Questions

  1. Is this a known issue with Adalo’s Xano integration on new apps?
  2. Has anyone else encountered /sessions/external_login 403/500 errors?
  3. Are there workarounds or alternative authentication methods?
  4. Should I use Custom Actions instead of native “Xano Sign Up”?

System Info

  • Adalo Plan: Business
  • Xano Plan: Launch (Free tier)
  • App: Newly created with Xano as default database
  • Xano Base URL: https://x8ki-letl-twmt.n7.xano.io/api:uqk7Yrjr

My Findings

  • :white_check_mark: Xano backend works 100% (curl test successful)
  • :white_check_mark: Xano endpoints are properly configured
  • :cross_mark: Adalo’s /sessions/external_login endpoint appears to be broken/blocking requests
  • :cross_mark: Error persists even on fresh app with Xano setup

I suspect this is an Adalo-side bug, not Xano, but I wanted to check if the community has solutions before contacting support.

Any help appreciated guys !

Thanks,

Sébastien