Could you please share more details about your sharepoint list?
I have made a test on my side to create a sharepoint list as below:
You could refer to screeshot below to create the flow:
The exression of the Title field in the Create html table action as below:
The exression of the Task field in the Create html table action as below:
The exression of the Assignto field in the Create html table action as below:
The flow would run successfully as below:
The email would be sent as below:
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