Why This Rejection Happens
The automated "Success! You are subscribed" message you provided in the registration failed to inform the user how to opt-out (STOP).
Root Cause Analysis
The Fix
Add the phrase "Reply STOP to cancel" to your Opt-in Confirmation Message.
✓ Correct Message
"Welcome to Brand Updates! Msg frequency varies. Msg&data rates apply. Reply HELP for help, STOP to cancel."
✗ Incorrect Message
"You are now subscribed. We will send you updates soon." (Missing STOP instructions)
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What reviewers check for code 6003
The opt-in confirmation message is the first text sent after someone joins. Carriers require it to confirm the enrollment and restate the program terms, because it is the subscriber's written record of what they agreed to. Reviewers check the sample confirmation message you submit for the brand name, a description of the program, message frequency, "Msg & data rates may apply", HELP instructions and STOP instructions.
For code 6003 (Opt-in Msg Missing STOP Info), the missing piece is the STOP / opt-out instructions. Subscribers must be told how to opt out before they agree. The standard wording is "Reply STOP to opt out" or "Text STOP to cancel". STOP must work immediately, and the instruction cannot be buried in the terms page only.
Where code 6003 comes from
Code 6003 is a campaign review reason code used to report a specific deficiency found during manual campaign vetting. CSPs surface it in the rejection notice alongside any other codes found in the same review, so check for companion codes before resubmitting. It is marked High severity: it blocks approval, but it is fully fixable by correcting the submission and resubmitting.
Example: opt-in confirmation message for a auto repair shop
The example below uses a fictional auto repair shop, Ridgeway Auto Care, to show the difference between a submission that triggers code 6003 and one that passes.
Rejected:
Ridgeway Auto Care: You're subscribed to repair status updates and service reminders. Msg frequency varies. Msg & data rates may apply. Reply HELP for help.
Approved:
Ridgeway Auto Care: You're subscribed to repair status updates and service reminders. Msg frequency varies. Msg & data rates may apply. Reply HELP for help. Reply STOP to opt out.
Fix and verify before resubmitting
- Submit the exact confirmation text your platform sends, not a paraphrase.
- Add the STOP / opt-out instructions where code 6003 flagged it, using the approved wording for Ridgeway Auto Care's program shown above.
- Keep it within two segments if possible so carriers do not truncate the disclosures.
- Trigger the flow with a test number and compare the live message with the submitted sample.
- Make sure no marketing offer is placed before the required disclosures.
- Confirm the same message is sent for every opt-in path (keyword, web, verbal).
- Resubmit with a note that references code 6003 and quotes the corrected STOP / opt-out instructions.
Sample resubmission note
Many CSPs let you add a note for the reviewer when you resubmit. A short, specific note shows what changed and speeds up the second review. Example for Ridgeway Auto Care:
Ridgeway Auto Care corrected the deficiency reported as code 6003 (Opt-in Msg Missing STOP Info). Changes made: submit the exact confirmation text your platform sends, not a paraphrase; add the STOP / opt-out instructions where code 6003 flagged it, using the approved wording for Ridgeway Auto Care's program shown above; keep it within two segments if possible so carriers do not truncate the disclosures. All URLs, keywords and auto-replies were re-tested from an external network before this resubmission, and the campaign text now matches the live opt-in exactly.
Common mistakes that keep code 6003 coming back
- Putting opt-out instructions only in the SMS terms page.
- Using a keyword other than STOP (for example REMOVE) without also supporting STOP.
- Requiring the subscriber to call or log in to unsubscribe.
- Editing the sample in the campaign but not the auto-reply the platform actually sends.
Related rejection codes
- Code 2131: Verbal Script Missing STOP Instructions
- Code 2127: Verbal Script Missing STOP Instructions
- Code 2126: Opt-in Form Missing STOP Instructions
- Code 8100: Sample Missing Opt-out Language
- Code 6006: Opt-in Confirmation Msg Missing
- Code 6005: Opt-in Msg Missing Fee Disclosure
- Code 6004: Opt-in Msg Missing Frequency Disclosure
- Code 6002: Opt-in Msg Missing HELP Info
Frequently asked questions about code 6003
Does code 6003 mean the whole campaign is non-compliant?
No. Code 6003 points to one gap: the STOP / opt-out instructions in your opt-in confirmation message. Fix that gap, check the rest of the submission against the same checklist, and resubmit. Reviewers often list only the first deficiency they find, so a full self-check prevents a second rejection.
Where exactly should the STOP / opt-out instructions appear?
Put the required elements in the opt-in confirmation text itself, ideally in the first segment. Subscribers must be told how to opt out before they agree.
Do I fix my live opt-in confirmation message or only the campaign text?
Both. Change the auto-reply in your messaging platform and paste the identical text into the campaign's opt-in message field.