Notification form selects lack an accessible name

WCAG warnings in the test class [org.xwiki.platform.notifications.test.ui.AllIT]:
Validation in the test method [null]
Check for [org.xwiki.platform.notifications.test.po.NotificationsUserProfilePage] at http://xwikiweb:8080/xwiki/bin/view/XWiki/NotificationsEmailsITuser1?category=notifications.
Found [1] items

1: Select element must have an accessible name
Description: Ensures select element has an accessible name
Help URL: https://dequeuniversity.com/rules/axe/4.6/select-name?application=axeAPI
Help: Select element must have an accessible name
Impact: critical
Tags: cat.forms, wcag2a, wcag412, section508, section508.22.n, ACT

HTML element:
<select class="notificationEmailInterval">
<option value="HOURLY">Hourly</option>
<option selected="selected" value="DAILY">Daily</option>
<option value="WEEKLY">Weekly</option>
<option value="LIVE">Live</option>
</select>
Selector: [.notificationEmailInterval]
Fix any of the following:
Form element does not have an implicit (wrapped) <label>
Form element does not have an explicit <label>
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attribute
Element's default semantics were not overridden with role="none" or role="presentation"

HTML element:
<select class="notificationEmailDiffType">
<option value="NOTHING">Nothing</option>
<option selected="selected" value="STANDARD">Standard</option>
</select>
Selector: [.notificationEmailDiffType]
Fix any of the following:
Form element does not have an implicit (wrapped) <label>
Form element does not have an explicit <label>
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attribute
Element's default semantics were not overridden with role="none" or role="presentation"

HTML element:
<select class="notificationAutoWatchMode" data-target="user" data-user="NotificationsEmailsITuser1">
Selector: [.notificationAutoWatchMode]
Fix any of the following:
Form element does not have an implicit (wrapped) <label>
Form element does not have an explicit <label>
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attribute
Element's default semantics were not overridden with role="none" or role="presentation"