A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
When I mentioned that text box controls were ActiveX controls above I was correct but you are using the shape text box, not the ActiveX control.
The limitation still applies: they are disabled when sharing.
There are no alternatives of which I am aware.
Workbook sharing is also not reliable and is known for causing workbook corruption.
Will the users be OK without sharing the workbook?
If not, then you will have to come up with something more creative such as formatting a range of cells to act as the bulleted notes entry area.
Kevin