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Hi Anonymous ,

Please refer to these:https://docs.microsoft.com/en-us/power-bi/service-create-the-new-workspaces#give-access-to-your-workspace 

https://community.powerbi.com/t5/Service/Access-app-workspace-to-B2b-users/td-p/602283 

Best Regards,
Liang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi Anonymous 

Can you provide additional context?

Generally, you need permissions to an app workspace in order to open it. Do you know who owns/created it? If so, ask that person to add you. 

In order to help you, please let us know:

1. what license you have (free or Pro)

2. is the app workspace in your same organization?

3. does your organization have a Premium subscription

4. Is the app workspace hosted in Premium capacity?

This article might help: https://docs.microsoft.com/en-us/power-bi/consumer/end-user-license

- Michele