Usually this is a permissions issue. I would check the permissions on the Sage folder containing your MAS90 folder. There have been cases where the permissions didn’t follow through down to the children folders, so it would be best to check that as well.
Here is a knowledgebase article on folder shares for reference: https://ie-kb.sage.com/portal/app/portlets/results/viewsolution.jsp?solutionid=200427112211041&hypermediatext=null
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