What happens when they try to make changes?

If the worksheet is protected (and that's what is stopping them, unshare the
workbook, unprotect the worksheet, unlock the cells that should be able to be
changed, reprotect the worksheet, reshare the workbook and try it again.)

What happens when they try to save?

(I don't have a guess here.)

wrote:

I have everything set up properly and other users cannot make and save
changes in a shared workbook. Any suggestions?

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Dave Peterson