Hi Thomas,
Thank you very much for the additional context and I apologize for the delayed response.
Here is a sample XML package that we exported into XWiki, which resulted in error messages of “unknown-macro: time” and “unknown-macro: task-list” respectively.
< ?xml version=“1.0” encoding=“UTF-8”? >
< hibernate-generic datetime="‘2023-09-19 15:34:47.904’" >
< ac:task>
< ac:task-id>4</ac:task-id>
< ac:task-status>complete</ac:task-status>
< ac:task-body>Done: Task 1 for < ac:link><ri:user ri:userkey=“0e163fbe424e9d0a01424e9e7d71016b” /></ac:link> </ac:task-body>
</ac:task>


The source code for the resulting XWiki page shows:
== Date ==
{{time datetime=“2023-04-18”/}}@ 10:00 - 11.30 AM
== Action items ==
{{task-list}}
{{task id=“4” status=“complete”}}
(% style=“color: rgb(255,0,0);” %)Done(%%): Task 1 for {{mention reference=“XWiki.user1” style=“FULL_NAME” anchor=“XWiki-user-1”/}} has sent. {{time datetime=“2023-04-21”/}}
{{/task}}
In terms of versions:
We are using XWiki 15.4, Confluence XML 9.20.1 and our Confluence version (Server license) is 8.2.3.
We do not have the Pro Macros installed on our demo site yet, but are aiming to add these in the future (not sure if that is contributing to our error messages?)
Thanks again. Please let me know if there is any additional information I can provide.