Cookie is not set when the site is entered with the utm parameter

Have you tried to check
– to clear the cache after changes?
– used private mode with 3rd party cookies accepted without adblocking / PiHole / DNS / VPN with adblocking features?
– whether you or one of your collegues have excluded that cookie?
– if the cookie is set while disable all features or disable the LS Plugin?

don’t know if this fits in this case… tried to vary the cache?
https://docs.litespeedtech.com/lscache/devguide/advanced/

Hi,

utm qs is default dropped

by that means

https://domain.com/

and https://domain.com/?utm=xxxxx

will hit same cache , and therefore no PHP execution

please consider to make it ajax call