Report not available in shared dashboard

Hi everyone,

Could you please assist me in solving the following issues:
I've imported an Excel spreadsheet into Power BI (online, no desktop client), then created simple report, associated with that spreadsheet, and finally shared it with couple of colleagues inside my organization.

But when colleagues opening the dashboard using the link in notification, they see only blank dashboard, and no report available in "Reports" menu.

Maybe I've done smth wrong...

Thanks in advance!