Failed to send share by email

[Lofwyr]

We are also seeing this issue. Same versions and installation options.
Actually, some more looking around gave this thread which fixed my issues for now:

Problems with federated shares and permissions/resharing

Nextcloud version : 16.0.5.1 and 16.0.4.1 (first item is the instance on webhosting, the second on the dedicated storage box from hetzner) Operating system and version : webhosting and storage box at hetzner.com Apache or nginx version : nginx, i think current stable version on both boxes PHP version : 7.3.10 and 7.3.9 The issue you are facing: I can create federated shares between users on both servers. i also see the sharing menu on the shares with the target users. but I’m not able to re…

Still waiting for a real fix though.