Selection Tags input- How to fix wrong field type?

In this form, the current user clicks their name (from the 1425MembersAccount) to sign up for a club. Their name is then inserted as a selection tag into the studentsName field in the dynamicDataset (clubDetails).

This is working, however I only get the field tags not the value of the text and I get this message " The value does not match the field type Tags"

Can anyone see my mistake?

Thanks
Sylvia

CODE

//test24
import wixData from 'wix-data';
$w.onReady(() => {
   //Extra Member details 
   $w("#1425MembersAccount").onReady(() => {
 let memberDataset = $w("#1425MembersAccount");
 let newStudent1 = memberDataset.getCurrentItem().nameOne;
 let newStudent2 = memberDataset.getCurrentItem().nameTwo;

        $w("#tag1").value = newStudent1;
        $w("#tag2").value = newStudent2;
        $w("#memberName1Text").value = newStudent1;
        $w("#memberName2Text").value = newStudent2;

        //clubDetails
        $w("#dynamicDataset").onReady(() => {
             let clubDataset = $w("#dynamicDataset");
             const currentStudents = clubDataset.getCurrentItem().studentNames;
        });

    });
});

function setTags() {
 const allTagsArray = [];
 const currentStudents = $w("#dynamicDataset").getCurrentItem().studentNames;
 allTagsArray.push('currentStudents');
 if ($w("#tag1").checked) allTagsArray.push('tag1');
 if ($w("#tag2").checked) allTagsArray.push('tag2');
 const allTagsString = allTagsArray.join(",");

    $w("#dynamicDataset").setFieldValues({ "studentNames": allTagsString });
}

export function tag1_click() {
    setTags();
}
export function tag2_click() {
    setTags();
}
export function submitButton_click(event, $w) {
    $w("#dynamicDataset").save();
    $w("#success").show();
    $w("#failed").hide();
}