I wonder if you are in the access list of the workspace including the content you want to access. By default, external Azure AD B2B limits guests to consumption of content only. External Azure AD B2B guests can view apps, dashboards, reports, export data and create email subscriptions for dashboards and reports. They can't access workspaces or publish their own content. To remove these restrictions, you can use the Allow external guest users to edit and manage content in the organization feature.
For further information, I'd like to suggest you refer Distribute Power BI content to external guest users with Azure AD B2B .
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Thanks for your reply. Yes we have configured as what you have mentioned. It was working fine before and there were no configuration changes.
The support page has posted the following that there was an issue with Pro Account. I guess this is the reason many of us are having issues out of the sudden?
"Power BI Pro customers trying to access externally shared content from a different Tenant may encounter a message asking to “Upgrade to Power BI Pro”. Engineers have identified the root cause and ETA for a fix is end-of-day 06/07/2020."
Same issue is happening with my clients. We share content (Reports and Datasets) with external Pro license users, they've been able to use the service without an issue until this week. They go their link, try to click on one of the objects and nothing happens.
I see the little blurb on the service page that says something is wrong with external sharing and that it's put on the back burner for fixing and no other information or link to something that I can pass along to my customers.
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