Office 365 asking for credentials when trying to open file sent trough outlook

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Occasional Visitor

So i have these two excel files on onedrive wich i update everyday and use the graphs made in them to make a powerpoint presentation almost everyday, recently when i send the powerpoint to my colleagues and they try to open it, it asks them for credentials to access the excel file from where i took the graphs.

 

The thing is that when they sign in an error window appears saying that another user has the file open or that a file with the same name is open in the computer.

 

Its really anoying has anyone have any idea?   

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