Many of the inputs in the Bulk Edit Tags app are case sensitive, this means that if you input a tag for the app to search for, it needs to exactly match the casing and format of the tag on your store.

For example, if I want to add the tag 'sale' to all of my items that have the tag 'old-items', if I input the tag as 'Old items' then Bulk Edit Tags will not be able to find any matching tags, as the correct format is actually 'old-items'

So running this job would result in no tags being added

The correct formatting would look like this in the app

Resulting in the 'sale' tag being added