If your users see an error regarding Adobe Flash Player not functioning, this message is due to the fact that Adobe has declared the Flash product to be End-Of-Life as of 31 December 2020, and as of 12 January 2021 blocked it from running. They made this announcement in 2017. Please see the following article on Adobe's website for additional information:
Adobe will not even be issuing security patches after the EOL Date. Adobe strongly recommends uninstalling Flash Player immediately. There is no workaround for this issue.