Hi team,
I created a flow such that , when User pasting particular keyword , it will show the template. The template in table format and I converted to HTML.
Example : when user sent "Major Incident" means , power automate will post template.
What I did :

I use the keyword trigger and when user post "Major Incident" on group,
It will show this message:

Above message achieved by HTML code which I pasted on post message .
HTML Code for above table :
<p> </p>
<table style="border: none;border-collapse: collapse;width:384pt;">
<tbody>
<tr>
<td colspan="8" style='color:black;font-size:19px;font-weight:700;font-style:normal;text-decoration:none;font-family:"Times New Roman", serif;text-align:center;vertical-align:middle;border:none;border-top:1.0pt solid windowtext;border-right:1.0pt solid black;border-bottom:1.0pt solid windowtext;border-left:1.0pt solid windowtext;background:#8EAADB;height:18.0pt;width:384pt;'>Major Incident Management Notification</td>
</tr>
</tbody>
</table>
Thing is , that template posting multiple times. Image references:

Untill I stop the flow , it keepposting.
Kindly help me to post that message on only one time.
Thanks & Regards,
Velmurugan