Set-ConfluencePage updates page with plain text only

[hajwil]

ConfluencePS version 2.5.1 with PS 7 and 5
I try to use Set-ConfluencePage to update a Confluence page with table style information in html format
Set-ConfluencePage -PageID -Body $Body -Convert

The $Body variable contains

<table><tbody>
<tr>
<th><p> id </p></th>
<th><p> name </p></th>
<th><p> version </p></th>
<th><p> status </p></th>
<th><p> userCapabilities </p></th>
</tr>
<tr>
<td><p> 88 </p></td>
<td><p> SRV-VMBUILD01-01 </p></td>
<td><p> 3.220.0 </p></td>
<td><p> online </p></td>
<td><p> CreateEnvironment=1; SqlPowershellModule=1 </p></td>
</tr>
</tbody></table>

This will only be shown as plain text in Confluence.
Also embedding the html string into structured macro template, it only shows the text
"<ac:structured-macro ac:name='html'>ac:plain-text-body</ac:plain-text-body></ac:structured-macro>"

This is not converted to a table style page. How to convert csv or html to a table structured page?