I am trying to find the difference and relation between these two cookies. Can you someone provide more details?
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In short
s_ecid = Contains a copy of the Experience Cloud ID (ECID) or MID.
amcv = The Experience Platform ID Service uses JavaScript to store a unique visitor ID in an AMCV_###@AdobeOrg
cookie on the domain of the current website, where ###
represents a random string of characters
Read in details about AMCV here and other cookies including s_ecid here
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Thanks Anil. We use WebSDK and I don't see the s_ecid is being consistently dropped in the browsers. So we had to fall back on AMCV.