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So of the 997 selected people 378 of them have no contacts at all and 385 have a contact but no valid details. The best way to fix these issues is by finding out what message setting you are using in Call Parents and then checking your MIS system to make sure the contact for that person has the relevant priority setting. An easy way to find out A list of who you need to check in your MIS is can be found by clicking on the number link (in this case 574). This will open a new page and show you all of the selected people that will not be sent a message.
The final part of the summary shows you who is going to be contacted, in this case 406 people, and receive at least 1 message. It also shows the selected people who will not be contacted, in this case 23, as their contacts have duplicate details match another person who has also been selected i.e. siblingsa sibling. Note - If you use the student first name place holder placeholder in any of your messages then it becomes a custom message and will send out to the same number/email for all siblings e.g. if one parent/carer has 3 students Billy, Sarah and Steven they will receive 3 SMS/email messages with each name present.
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