Binding の BindingElementCollection の最初の要素が DiscoveryClientBindingElement ではありません。DiscoveryClientBindingElement が最初になるように要素の順番を変更してください。

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The DiscoveryClientBindingElement does not appear first in the BindingElementCollection of the Binding. Please change the order of elements such that the DiscoveryClientBindingElement is first.

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