Export to Excel not showing up for users

Hi guys,

I got a master dataset A in an admin workspace X.
I created a new pbix using dataset A as the source and published it to workspace B for my accounting team.
Now, they need to download certain data from that report in workspace B to excel, but the button to export data to excel is not showing up for them.
I, as an admin and owner of all datasets and workspace can see that button.

I didn't define any RLS yet or other security groups in power BI / O365.
I turned on the permission to export summarized and underlying data in the pbix files.
I checked the global permission to allow export data in the power BI service, it's activated for whole organization.
I tried all workspace permission roles for that accounting user, not even with admin it seems to work.

What did I forget to make this work?
I hope you guys can help me!

Best regards,
Jano