AppSync: Uploading .xml license file in UI receives error: Adding the license failed due to "Invalid license file"

In AppSync UI, when uploading .xml license in Settings > License > Upload, receive an error:

Adding the license failed due to "Invalid license file"

The first scenario seen was the entire <lockingID> section was missing from the license file.
There should be a lockingID section like the following:

<LockingIds>

	<LockingId>

		<LockingIdCode>HOSTID</LockingIdCode>

		<LockingIdValue>value</LockingIdValue>

	</LockingId>

</LockingIds>

The second scenario seen was the LockingIdCode being inappropriately found to be XIOD like so:

<LockingId>

	<LockingIdCode>XIOID</LockingIdCode>

When it should be HOSTID

<LockingId>

	<LockingIdCode>HOSTID</LockingIdCode>

The internal licensing generation mechanism is updated to ensure the Locking ID section is populated.

A new license is needed. Obtain a new license from the licensing team.