@mohitkhare123  you can use the landing page to opt in.   check out https://experienceleague.adobe.com/en/docs/journey-optimizer/using/landing-pages/create-lp#configure-subpages  https://experienceleague.adobe.com/en/docs/journey-optimizer/using/email/design-email/add-content/message-tracking#inser...

@SaurabhDeswal  There is no wait activity on the journey level. At audience level check if the current date is greater than 7 days from the last purchase date. If anyone is eligible, send a reminder email on the current date.   However the use case is specific to each SKU and it’s purchase date.. so...

@SaurabhDeswal  Can you create an audience with the latest purchase date/order date less than 7 days from the current date and use the audience in a journey to send reminder purchase mail?

@gmuirkb  can you cross-check on filters,  Were there any extra filters applied on top of unique email opens metric ? if all looks correct and, still see a huge difference in counts, please create a support ticket.

@gmuirkb  Could you please verify that the date range of the calendar is the same for both reports? A little difference in the counts is expected, but not how it is mentioned above.

@uk685  This could be because duplication status is not enabled in placements. do allow duplication at placements and validate.   check out the multiple scope section https://experienceleague.adobe.com/en/docs/journey-optimizer/using/decisioning/offer-decisioning/create-manage-activities/create-offe...

Please look at the blog which covers the difference between Adobe Campaign & AJO in detail and the need for co-existence of these 2 tools. https://experienceleaguecommunities.adobe.com/t5/journey-optimizer-blogs/co-existence-of-adobe-journey-optimizer-ajo-and-adobe-campaign/ba-p/694403