I've had this a few times recently and for mine I found there was under the Participants Tab and blue i over the Proprietor on Titles Names and when clicked it says there is identification information missing.
If this is the case ask the responsible subscriber to check they have enter the dates of birth. If they have ask them to re enter the Proprietors information. This should then remove the blue i over the Proprietor on Titles name and you can then go back and verify Duty.
Hope this works for you too.
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