Windows Clipboard playground to investigate:

• #9901 Clipboard.SetText fails with CLIPBRD_E_CANT_OPEN
• #25437 PowerToys Run Calculator Click to 'Copy this number to clipboard' fails, with error dialogue

References

Win32 API

• Using the clipboard

• GetClipboardOwner

• OpenClipboard

• SetClipboardData

• CloseClipboard

• WM_RENDERFORMAT

• The Old New Thing: What is the proper handling of WM_RENDERFORMAT and WM_RENDERALLFORMATS?

• The Old New Thing: How can I find out which process has locked me out of the clipboard?

OLE2 API

• OleSetClipboard
• OleFlushClipboard