When you configure fileapi_sources via specific
roles ($config['kolab_auth_role_settings']) these changes
won't get applied when starting a wopi sessions.
Error on WOPI Server
wsd-00030-01059 2020-02-08 19:53:36.755875 [ docbroker_058 ] ERR WOPI::CheckFileInfo failed with 500 Document session not found.| wsd/Storage.cpp:545