Re: Issue in adding fields from sharepoint and Microsoft forms
Hi @raionkar,
Could you please share a full screenshot of your flow's configuration?
Do you want to reference the Dynamic contents of the "Get items" action within the expression formula?
I have made a test on my side and please take a try with the following workaround:

Within Description field of the "Update item" action, type the following formula:
concat(item()?['Executor'],' Submitted ',body('Get_response_details')?['r88c746804d434ddd8e4420f6d92ef5d5'])
Note: Use the item()?['ColumnNameOfSharePointList'] expression to reference the Dynamic contents within your "Get items" action. The Executor within my above formula is a column in my SharePoint list. The body('Get_response_details')?['r88c746804d434ddd8e4420f6d92ef5d5'] expression represents the Answer Dynamic content of the "Get response details" action, in order to include dynamic content from the "Get response details" action within your expression formula, you could select the Dynamic content tab and simply click the field you want to use.
On your side, please consider take a try to use the following formula to reference the Dynamic contents of the "Get items" action:
item()?['ColumnNameOfYourSharePointList']
Or
items('Apply_to_each_2')?['ColumnNameOfYourSharePointList']
Note: The "Apply_to_each_2" represents the name of the "Apply to each" action which includes the "Update item" action within my flow.
More details about using expression in flow actions, please check the following article:
Use expression in flow actions
More details about the item() expression in Microsoft Flow, please check the following article:
item() function
Best regards,
Kris