Issue when sharing a report

Simon_Striegel 

Please refer the below links for pre-requisites.

https://docs.microsoft.com/en-us/power-bi/service-share-dashboards

For external users.

https://docs.microsoft.com/en-us/power-bi/service-admin-azure-ad-b2b

If it is not cause of the issue, please try to re-pro the issue.

Might be an intermittent issue.

If the issue is persists, please let us know.

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Hi Simon_Striegel ,

Please refer to those similar threads and try the solutions of them, We also suggest you to delete the information of IDs that are not nessary in this forum: 

https://community.powerbi.com/t5/Service/ERROR-Failed-to-send-email-to-invite-users-Please-try-again/td-p/314057/page/2

https://community.powerbi.com/t5/Service/Trying-to-share-dashboard-but-getting-failed-to-send-e-mail/td-p/332691

https://community.powerbi.com/t5/Service/Share-dashboard-outside-organization-with-premium-license/td-p/344655

Best regards,

Community Support Team _ Dong Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.