I managed to get a response from the Canon Support Team who have confirmed that the clicking noise is no cause for concern and absolutely normal. Attached a screenshot of the email. Happy days! Loving my Canon M50 ii.
Hello there, I just unboxed my Canon M50 Mark ii and am experiencing exactly the same clicking issue when tilting/shaking it. Did you manage to find an answer to your question elsewhere? Is this something to worry about?Thank you from Scotland!