Widget appearing in edit mode but not on the live website

I was asked to add the below code by Simplybook.me and the widget appears while I am in edit mode but not on the full website. Any help would be really appreciated.

<script src="//simplybook.it/v2/widget/widget.js">
<script>var widget = new SimplybookWidget({"widget_type":"iframe","url":"https:\/\/urbanmissions.simplybook.it","theme":"concise","theme_settings":{"timeline_show_end_time":"0","timeline_modern_display":"as_slots","light_font_color":"#ffffff","sb_secondary_base":"#28243c","sb_base_color":"#5a3afd","display_item_mode":"block","booking_nav_bg_color":"#ffffff","dark_font_color":"#333333","sb_company_label_color":"#b390ff","hide_img_mode":"0","show_sidebar":"1","sb_busy":"#dad2ce","sb_available":"#d3e0f1"},"timeline":"flexible","datepicker":"top_calendar","is_rtl":false,"app_config":{"predefined":[]}});

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Squarespace Expert & Professional Developer