Why does Garmin OAuth1.0a setup in n8n return 'Unable to get access tokens!'?

Hi, I love using n8n, but I’m having trouble connecting to the Garmin API via OAuth1.0a.

After setting all the OAuth1 parameters and clicking on Connect my Account, I get redirected to Garmin’s login page. Once I log in and grant permissions, the callback returns the following response:

code: 0
message: "Unable to get access tokens!"
hint: ""

Here are some details about my setup:

• I’ve confirmed that all OAuth1 parameters are correct — they work with another OAuth library in Python.
• I’m running n8n version 0.152.0.
• My Docker configuration (based on the server install docs and running on a VPS) is as follows (for brevity, I’ve omitted the Traefik config):

YAMLCopied
 n8n:
    image: n8nio/n8n
    restart: always
    ports:
      - "127.0.0.1:5678:5678"
    labels:
      - traefik.enable=true
      - traefik.http.routers.n8n.rule=Host(`${SUBDOMAIN}.${DOMAIN_NAME}`)
      - traefik.http.routers.n8n.tls=true
      - traefik.http.routers.n8n.entrypoints=web,websecure
      - traefik.http.routers.n8n.tls.certresolver=mytlschallenge
      - traefik.http.middlewares.n8n.headers.SSLRedirect=true
      - traefik.http.middlewares.n8n.headers.STSSeconds=315360000
      - traefik.http.middlewares.n8n.headers.browserXSSFilter=true
      - traefik.http.middlewares.n8n.headers.contentTypeNosniff=true
      - traefik.http.middlewares.n8n.headers.forceSTSHeader=true
      - traefik.http.middlewares.n8n.headers.SSLHost=${DOMAIN_NAME}
      - traefik.http.middlewares.n8n.headers.STSIncludeSubdomains=true
      - traefik.http.middlewares.n8n.headers.STSPreload=true
    environment:
      - N8N_BASIC_AUTH_ACTIVE=true
      - N8N_BASIC_AUTH_USER
      - N8N_BASIC_AUTH_PASSWORD
      - N8N_HOST=${SUBDOMAIN}.${DOMAIN_NAME}
      - N8N_PORT=5678
      - N8N_PROTOCOL=https
      - N8N_DIAGNOSTICS_ENABLED
      - N8N_USE_DEPRECATED_REQUEST_LIB
      - EXECUTIONS_DATA_PRUNE
      - EXECUTIONS_DATA_MAX_AGE
      - WORKFLOWS_DEFAULT_NAME
      - NODE_ENV=production
      - WEBHOOK_URL=https://${SUBDOMAIN}.${DOMAIN_NAME}/
      - GENERIC_TIMEZONE=${GENERIC_TIMEZONE}
      - TZ=${GENERIC_TIMEZONE}
    volumes:
      - ${DATA_FOLDER}/.n8n:/home/node/.n8n
      - /home/deploy/app/n8n/local-files:/files

I also set N8N_USE_DEPRECATED_REQUEST_LIB=true as suggested in another post, but the issue persists.

Any suggestions or troubleshooting tips to resolve this issue would be greatly appreciated.

Thank you!