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Please go to ‘GTM Kit > Help > Support > Share system data with the GTM Kit support team’ and enter the support ticket: FS807-A8318
I have just tested your site.
GTM Kit is configured correct and I have tested the checkout using Tag Assistant. As you can see the event begin_checkout is pushed to the datalayer and data is as it should be: https://imgur.com/a/YxKsRso
You may have a problem in your Google Tagmanager configuraion but GTM Kit is working as expected.
Great, thx for your support!