Share Files not possible

Hey guys,

i have a problem. I updated my nextcloud 13 to nextcloud 16. after updating i couldn’t share Files or Folders via Mail. The Mail get delivered with a link, but after using the link, nextcloud says “Files not found”
i installed a new nextcloud 16, configured everything and got the same problem (i used the Turnkey Nextcloud image)
has somebody an idea what to do?