Scheduled tag addition not triggering workflow in response

Scheduled tag addition not triggering workflow in response

Hello,
I have 2 workflows : workflow 1 and workflow 2. Workflow 2 triggers whenever a specific tag(reminder 3) is added to a contact. When I manually add the tag, workflow 2 seems to trigger alright. But when the same tag(reminder 3) is added through workflow 1 as a scheduled action, workflow 2 fails to trigger. What might be the problem?