Sharepoint 2019 OneDrive for Business external sharing

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Occasional Visitor

Hello community, maybe someone can help me out with a small (or big :D ) problem.

Our company decided to setup a Sharepoint 2019 Server inside our infrastructure to make external sharing for files and folders to our customers possible and to give our customers the possibility to upload files and folders to the users onedrive.

So we setup a single sharepoint server farm. inside our network everything works pretty fine. users can share and upload files. but external invite / sharing from the users onedrive site is not working since we get the message, that this site does not support external sharing. is there anybody who can support with this problem? i also activated anonymous links but i still get this message when entering an external email-address. 

The Sharepoint server is published through a firewall reverse proxy and a public certificate.

 

thanks a lot for any suggestions :)

 

Cheers Mirco

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