grantTeacherAccess() on first create/edit

mod_form.php

@@ -8,13 +8,15 @@
  */
 use mod_labnbook\fetch;
 use mod_labnbook\form\select_dynamic;
+use mod_labnbook\local\helper;
 
 \defined('MOODLE_INTERNAL') || die();
 
 require_once($CFG->dirroot . '/course/moodleform_mod.php');
 
 // short-cut before loading the form, see `course/modedit.php`
-\mod_labnbook\local\helper::requireLabnbookAuthentication();
+helper::requireLabnbookAuthentication();
+helper::grantTeacherAccess($COURSE->id);
 
 \define('TEAMCONFIG_METHOD_STUDENTS', 1);
 \define('TEAMCONFIG_METHOD_RANDOM', 3);