Does the GTM-tag automatically track acitivity on my subdomains if it’s installed on the main domain?

Does the GTM-tag automatically track acitivity on my subdomains if it's installed on the main domain? As the title says, if I install the GTM-tag in the header and body of my main domain, will the subdomains also be tracked then? I'm wondering because the checkout for my ecommerce store lays under a subdomain, and I don't have access to the html code of the checkout. Therefore there's no way for me to add the tracking code from Google tag manage...

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