took a second look at this got it up and running.   steps i took-- reinstall/enable 'Nextcloud Office' (5.0.3) app.     Collabora (default/latest)-    edit container and remove the 'Domain' Variable. add  new Variable   save.   in NginxProxyManager- specify https protocol and the server host/ip and port 9980. Also enable Websockets Support. On the SSL tab select a new certificate, enable HTTP/2.
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