Hi @yuhuisg Can you please expand more on this?

Hi @Pablo_Childe  No to all questions.

Marketing channel expiration is set to 7days same as tracking code. If these 2 have the same allocation then it shouldn't be a persistence problem,right? 

URL structure for email  site.com?ecid=e:pr:promo:eam:doff:mcl:050222_SpringEvent&mi_u=233715898&mi_ecmp=050222_SpringEvent&link=hero&cluster_number=&em_cid=5123439&em_rid=233715898 for Paid search its ?ecid=s:

Thanks @Pablo_Childe will try that..