Hey there, @Matteo_S. Thanks for getting back to the thread.
Let me jump into this conversation and provide you with further info about management reports in QuickBooks Online.
Since other users were unable to view custom management reports, they can add their secretary as a user in QuickBooks. This way, they can manually create a management report and send or export the reports on their behalf.
Moreover, creating scheduled management reports is unavailable in the program.
For additional reference about managing reports and users in QBO, you can check these resources:
If you have follow-up questions about handling management reports, just add them to the thread. We'll be here to help you out. Have a good one.
