Please help us help you and fill where relevant:
Your LimeSurvey version: Release 6.3.4
Own server or LimeSurvey hosting self hosted
Survey theme/template: default
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I want the End message to have the response ID. Is this possible?

I tried this in the Attachment and it did not work.
 

Hi,
as you can see in the manual
[url] www.limesurvey.org/manual/URL_fields/en#Basic_fields [/url]
the response ID is accessed by {SAVEDID}

Basic fields
You can use {SAVEDID}, {TOKEN}, {SID}, and {LANG} in the end URL:

• SAVEDID is the id assigned to this particular submission;
• TOKEN is the token used to participate in the survey;
  ....

Joffm

Thank you. Worked.