Assigning Contact tags not being recognised in Campaigns

Assigning Contact tags not being recognised in Campaigns

In CRM, I have set up workflow rules based on a field being updated and then an instant action of a TAG is applied.

In workflow automations in Campaigns, under Contacts, the TAGs listed I clicked on and it states there are no Contacts with these TAGs but there are!!

Totally confused with TAGs and why they don't communicate between modules!

Can anyone help please?