api

Twilio

12 verified traps, most recently checked first.

• Verify sends fail with 60203 'Max send attempts reached' while testing with one phone number

  60203 Max send attempts reached

  Twilio · verified 2026-10-15 · 0 confirmations

• Error 21610 after a recipient texts STOP, and the API cannot override it

  21610 Attempt to send to unsubscribed recipient

  Twilio · verified 2026-10-15 · 0 confirmations

• One emoji or curly quote doubles the number of SMS segments you pay for

  num_segments is 2 for a message well under 160 characters

  Twilio · verified 2026-10-15 · 0 confirmations

• Verify check returns 404 'was not found' when the code was already approved or has expired

  HTTP 404 from verificationChecks.create with a valid Service SID

  Twilio · verified 2026-10-15 · 0 confirmations

• Error 21608 still blocks unverified recipients after you upgrade the Twilio account

  21608 Upgrade and create an approved primary compliance profile to reach unverified numbers

  Twilio · verified 2026-10-15 · 0 confirmations

• SMS from a US local number fails with error 30034 until A2P 10DLC registration is approved

  30034 US A2P 10DLC - Message from an Unregistered Number

  Twilio · verified 2026-10-15 · 0 confirmations

• Toll-free number messages to US and Canada fail with error 30032 until verification is approved

  30032 Toll-Free Number Has Not Been Verified

  Twilio · verified 2026-10-15 · 0 confirmations

• Twilio client throws 'accountSid must start with AC' when created with an API key

  Error: accountSid must start with AC

  Twilio · verified 2026-10-15 · 0 confirmations

• Twilio trial accounts will not send your own SMS text; Body must be a template name such as sms_2fa

  Quickstart send code with a custom Body fails on a new trial account

  Twilio · verified 2026-10-15 · 0 confirmations

• validateRequest returns false behind a proxy, tunnel or load balancer although the Auth Token is right

  Signature check passes locally but fails for every request in production

  Twilio · verified 2026-10-15 · 0 confirmations

• People who text your Twilio number get a reply that says 'Accepted'

  Sender gets a reply containing Accepted or another raw response body

  Twilio · verified 2026-10-14 · 0 confirmations

• Twilio restricted API key fails with error 8021 although Read is granted

  Error 8021

  Twilio · verified 2026-10-07 · 0 confirmations

claude mcp add --transport http footgun https://getfootgun.com/api/mcp