little update: after digging a bit deeper, the issue is in fact the same as in https://github.com/nextcloud/server/issues/223
Related to OVH shared hosting, not the app itself…
Thanks for you support anyway! 
little update: after digging a bit deeper, the issue is in fact the same as in https://github.com/nextcloud/server/issues/223
Related to OVH shared hosting, not the app itself…
Thanks for you support anyway!