If you've registered your clients for MTD under your Agent Services Account, you can authorise yourself to submit on behalf of them in QuickBooks by going to the Cog > Company settings > Advanced > Making Tax Digital for your clients > Learn how to connect > Follow the on-screen flow to connect.
Once this is enabled, you'll then need to go into each eligible client account individually and select Taxes > Edit VAT > Edit Settings > Slide on the switch for MTD - we've got the full guide here for reference. 🙂
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