Reply & Timeline component error: Sending e-mail with new comment failed. First exception on row 0; first error: INSUFFICIENT_ACCESS_ON_CROSS_REFERENCE_ENTITY, insufficient access rights on cross-reference id: []

You have just configured the Reply & Timeline component for your Digital Experience site (Community Portal), and are unable to send comments out.

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Reply & Timeline component error: Sending e-mail with new comment failed. First exception on row 0; first error: INSUFFICIENT_ACCESS_ON_CROSS_REFERENCE_ENTITY, insufficient access rights on cross-reference id: []
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Reply-Timeline-component-error-Sending-e-mail-with-new-comment-failed-First-exception-on-row-0-first-error-INSUFFICIENT-ACCESS-ON-CROSS-REFERENCE-ENTITY-insufficient-access-rights-on-cross-reference-id