If you still need to use momentjs, you can load this plugin to use moment to parse input dates.

//example picker
//note that you can optionally provide the format to use.
tempusDominus.extend(tempusDominus.plugins.moment_parse, 'DD.MM.yyyy hh:mm a');
const datetimepicker1 = new tempusDominus.TempusDominus(document.getElementById('datetimepicker1'));