Issue
If a copy and paste has quietly stopped working for you in Microsoft Excel or for anyone in your team. it is not a problem specific to you.
Microsoft confirmed this in a Support update for excel 2016 dated 8 September 2026.
As per Microsoft’s support article, copy & paste functionality may silently fail for office version 2016 to 2026 and there is not beep or onscreen alert that may notify the user.
Solution
Microsoft will update the above linked article as more information is available or may issue new advisory or article.
Disclaimer: Not Affiliated with Microsoft. Just a technology solution provider.