UNC Path Not Working in SUMIF, VLOOKUP etc

Thank you for looking at my question,

I have a workbook that I need to make available to other users across our network. The SUMIFS, VLOOKUPs etc pull data from another workbook (SupportData.xlsx) resident on the same server.

The SUMIFs and VLOOKUPs point to SupportData.xlsx using the drive letter mapped on my pc but other users have different mappings so I updated the formulae to include the UNC path and now everything returns a #REF! reference error.

=SUMIFS('O:\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[Total],'O:\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[ItemNumber],$B6,'O:\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[Issue_Year],"2017")

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=SUMIFS('\\gbd1prod\production\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[Total],'\\gbd1prod\production\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[ItemNumber],$B6,'\\gbd1prod\production\Materials Data\Tube Assemblies\SupportData.xlsx'!tblPI_Average[Issue_Year],"2017")

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Is anybody able to tell me where I've gone wrong please?
Gary CroxfordOperations Support AnalystAsked:
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Neil FlemingConsultant and developerCommented:
Not sure if this is the cause, but Excel has some known issues relating to UNC paths, in particular a habit of automatically amending an UNC path to a mapped drive letter, if the path happens to be mapped.

See, eg:


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Gary CroxfordOperations Support AnalystAuthor Commented:
thanks Neil, need to go and do some reading,
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