Hey @ambikaTewari_ATCI,
Thanks for reaching out!
Per our docs, If you load at.js via a tag manager, which is also loaded asynchronously, you must add the snippet before loading the tag manager. If the tag manager is loaded synchronously, the script might be included within the tag manager before at.js. Therefore, for your use case, the snippet must be added to the page prior to the Launch embed code, directly on the page.
Hope this helps!