ok - after much time I am back where I was hours ago - situation the same - run works compose doesn’t. I’ve captured logs from both attempts and although there are a large number of lines even when it works (which seem strange) - the key seems to be multiple blocks like this in the compose logs:
collabora | wsd-00001-00046 2023-03-13 15:15:36.232193 +0000 [ docbroker_003 ] ERR Failed to add session to [hxxx://fred.xxxxx.com:443/index.php/apps/richdocuments/wopi/files/35_ocy7j2wq2ex0] with URI [hxxx://fred.xxxxx.com/index.php/apps/richdocuments/wopi/files/35_ocy7j2wq2ex0?access_token=a0ChrRWCI5MDSZll5j3lAlQOOiCZBWF9&access_token_ttl=1678756534000&permission=edit]: No acceptable WOPI hosts found matching the target host [fred.xxxxx.com] in config.| wsd/DocumentBroker.cpp:2377
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editing the same file in the run initiated session gives me this (with other repeated read failed lines) but it retrieves and edits perfectly.
wsd-00001-00039 2023-03-13 15:19:10.769783 +0000 [ docbroker_001 ] ERR Failed to lock docKey [hxxx://fred.xxxxx.com:443/index.php/apps/richdocuments/wopi/files/35_ocy7j2wq2ex0] with session [00b] after downloading: | wsd/DocumentBroker.cpp:1009
wsd-00001-00036 2023-03-13 15:19:12.908633 +0000 [ websrv_poll ] ERR #33: Read failed, have 0 buffered bytes (ECONNRESET: Connection reset by peer)| net/Socket.hpp:1136