Hi @NosajNap ,
Could you please share a bit more about your data source? Which data source do you use to store your form data? A SP list?
Could you please share a screenshot about your flow's configuration?
I assume that your data source is a SP list and the Assignee(s) column is a Person type column in your SP list, and your flow use the "When an item is created" trigger of SP list connector as the Trigger.
I have made a test on my side, please take a try with the following workaround:
Note: The AssignedTo column is a Person type column in my SP list, on your side, you should type your Assignee(s) Email dynamic content here.
If your data source is not a SP list, and you use "PowerApps" trigger button as the Trigger of your flow, you could consider pass the corresponding Assignee(s) person email to your flow:
Within your app, you need to create a flow connection to above flow. Then add the following formula within the "Submit" button:
'YourFlowName'.Run(AssigneesComboBox.Selected.Email)
Note: The AssigneesComboBox represents the ComboBox control within your Assignee(s) Data card.
More details about trigger a flow from an app, please check the following article or video:
Start a flow from an app
https://www.youtube.com/watch?v=1wl9AtxWdkg
In addition, if you have obtained the Assignee User name within your flow already, in order to get the email address of this person, I think the Office 365 Users connector could achieve your needs. I have made a test on my side, please take a try with the following flow workaround:
Within the "Create a task" action, Assigned User Ids field set to following formula:
first(body('Filter_array'))?['DisplayName']
Please take a try with above solutions, then check if the issue is solved.
Best regards,