On September 8, Microsoft rolled out KB5002914 for Excel, but it apparently has a bug that makes it impossible to copy and ...
Microsoft has confirmed a copy-and-paste issue affecting Excel 2024, 2021, 2019, and 2016 after the KB5002914 security update.
Microsoft has fixed Excel copy-and-paste failures caused by September 2026 updates across Office 2016, 2019, 2021, and 2024.
Microsoft fixes Excel 2016 copy-and-paste failures caused by KB5002914, while other Excel versions still need workarounds.