Hey gaureshk30144236,
The parameter being added in the redirect is expected behavior.
What the 'adobe_mc_sdid' parameter does:
"The 'adobe_mc_sdid' parameter passes the Supplemental Data Id (SDID) and Experience Cloud Org Id from the default page to the new page in order for A4T to "stitch" together the Target request on the default page with the Analytic request on the new page" (see Redirect offers - A4T FAQ).
Not using A4T and thinking of removing this parameter?
"If you are not using A4T with your redirect activity, you have the Visitor Id service implemented, and you don't want these parameters to be automatically added to your URLs, you must use a custom-coded redirect.
However, as best practice, you might want to keep the adobe_mc_ref parameter in the URL in order to report the referrer information to Analytics correctly."