I've set up Amplitude event tracking through Google Tag Manager (GTM) and have an Initiate Tag and a Track Tag configured. When a user signs up, I can see the data recorded under the 'Registered' event. However, UTM details like utm_medium and utm_source are being logged under event properties instead of user properties.

I tried creating a separate tag in GTM to set user properties, but the UTM details still don't appear under user properties in Amplitude. Can anyone help me understand what I might be doing wrong or guide me on how to properly set UTM details as user properties?