Issue with Campaigns that were migrated from lower to upper environment

Hi Team,

I created and tested campaigns in lower environment and migrated them to upper environment. I have been able to map campaign record and flow in upper environment; but when I trigger the campaign in upper enviorment, it is not picking up the audience at all. To check if it's a campaign filter issue, I removed all the filters so that campaign picks up the entire contact list; but the problem still persisted. What can be done to resolve this issue? Thanks for your help!