Can't get federated sharing to work

[rugk]

Possibly:

Federation: cannot add trusted server

I think this is caused by a issue I fixed here: https://github.com/nextcloud/server/pull/3825 I plan to backport it to stable11 as soon as it merged. For the issue we discuss here, I think this particular change will fix it: https://github.com/nextcloud/server/pull/3825/commits/1f1e36ac6560161ed6c26b8dbe980bfc62733581#diff-ec69af4ceadfc4207fcfd3373d0b9338 If you feel comfortable enough you could apply this changes to all the involved servers. Remove the trusted servers and add them again. (Yo…