You cannot add websites when choosing the free plan

When I add a website and select the free plan, it displays the message:
Refer to https://cfl.re/3VUQyyL for assistance. The zone you are trying to upgrade is marked as Do Not Upgrade. (Code: 1315)
Refer to https://cfl.re/3VUQyyL for assistance. The zone you are trying to upgrade is marked as Do Not Upgrade. (Code: 1315)

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