I have bought tons of addon airports for MSFS2024.   Now, I want to add KMEM update. It costs $5.  When I hit on the BUY button, a window pops up quickly and disappears in a split second, and thus I can't seem to buy it.  Do I need to buy tokens?  Can't do that either.  Before,I paid by credit card.  

Someone suggested I need to turn ON SCREEN OVERLAY.  I don't know if that is the issue. And  can't find anyone to tell me how to turn screen over lay on.  I have  MS2024 in the regular version- not Steam.  

OK - problem solved.  The error was on their (Microsoft side).  They seemed to fix it and now I can buy scenery.