LXD and curl SSL issues 'cURL error 35'


I decided to run Nextcloud in an LXD container for some system separation.
The container has two cards attached eth0 and eth1 (both bridged from host ports).
Eth0 in 192.x.x.x can reach the Internet
Eth1 in 10.x.x.x is only routed to local LAN

When I connect to Nextcloud from the 192.x.x.x network I get full access, can download apps, users from LAN AD are found and can connect.
However if I connect to the instance from 10.x.x.x I don’t get apps thumbnails nor can install any with cURL erroring:

An error occured during the request. Unable to proceed.

cURL error 35: error:1408F10B:SSL routines:ssl3_get_record:wrong version number (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

Any suggestions where to start with this?