The tour function included as part of the site does not include instructions for navigating the tour via the keyboard.
Instructions are helpful for everyone to be able to understand how a component or process works. When steps or interactions are ambiguous people rarely experiment to determine what they're supposed to do and more often give up on the task they are attempting. Refer to this W3C technique article for more information about instructions, "Providing text instructions at the beginning of a form or set of fields that describes the necessary input" - https://www.w3.org/WAI/WCAG22/Techniques/general/G184 In this instance the tour could be completed using the keyboard, which is commendable, but the tester spent several minutes attempting to access the on screen buttons in the dialogs using tab navigation before discovering that the arrow keys also advanced the tour. Recommend including some text in the dialog that explains the options for keyboard navigation. Suggest:
Use the buttons or the arrow keys to navigate the tour. ESC will close the tour.