We have marketing cloud visitor id (mid) setup on all our domains.
But, what we are seeing is that a different mid gets setup for every domain.
What we are noticing is that :
1. Org Id is the same in each case
2. mid is different in each.
Any ideas on what we might be missing out on here!!
Your first domain supports cookie : www.stubhub.com
You second domain didn't : www.stubhub.co.uk
For your first domain, Cookie Domain Period is not needed since the Domain Period by default is 2. But for your second domain, it is 3 and you have to set this inside Marketing Cloud ID Service. Please do so and test it.
Link for knowledge : s.cookieDomainPeriods
Make sure that your domains support Cookies. If yes, it should never be the case.
Can you share your public domains to verify?