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If anyone is also suffering this - the reason is because the schema is immutable.

I've managed to solve it by destroying my user pool and then re-creating it with the schema containing the attributes I want to be required:

```schemas: [ {
      name: "email",
      attributeDataType: "String",
      mutable: true,
      required: true
    }, {
      name: "name",
      attributeDataType: "String",
      mutable: true,
      required: true
    }, {
      name: "account",
      attributeDataType: "String",
      mutable: true,
      required: false
    } ],```