Hi,

my colleagues and I want to work on one MS Excel document all at the same time. We all have Office 365 ProPlus packages.

What I've done so far:
- Created the file and stored it on my sharepoint
- Used the "Share" Option on the top right in MS Excel and added colleagues (all from the same domain as me)

Then my colleagues get an E-Mail with a Link to open this shared Excel file. They can open it in Excel Online or with their desktop version of Excel. But when they try to open it, it says that the document is already open/in use (by me) and therefore, they can choose to open it as write-protected or work on a copy of the file only.

Am I doing something wrong here? Any ideas?
Thanks in advance!