Hi @Anonymous ,
I made tests both in Dataverse for Teams and Power Apps studio, found that it is available to submit priority level only with action CreateTaskV4 of the Planner connector, however, this action is preview and only available in Power Apps studio or Power Automate, in Dataverse for Teams you could see there is only CreateTaskV3 instead.
Details of CreateTaskV4 action please refer to below doc:
https://docs.microsoft.com/en-us/connectors/planner/#create-a-task-(preview)
I believe that this preview action would be released to Dataverse for Teams in the future, so that it would easily achieve your need. I will leave the detailed steps about this scenario below so that you can modify the App at that time.
1\ On Issue Report Screen, add a section in cnvIssueReport. Add a Combo box with Items set to:
Table({Name:"Urgent",Value:"1"},{Name:"Important",Value:"3"},{Name:"Medium",Value:"5"},{Name:"Low",Value:"9"})

2\ Add another section, copy and paste the submit button in this Card.

3\ Remove the old submit Card from the screen.
4\ Add a parameter "appPriority" in the locNewTask variable:
appPriority:ComboBox1.Selected.Value,
//Combobox1 is the new added combo box name

5\ Modify below variable:

to:
UpdateContext(
{
locRecordPlannerTask: Planner.CreateTaskV4(
gblPlannerGroupId,
gblPlannerPlanId,
locNewTask.appTitle,
{
bucketId: locNewTask.appBucket,
startDateTime: locNewTask.appStart,
dueDateTime: locNewTask.appDue,
priority:locNewTask.appPriority
}
)
}
);
Hope this helps.
Best regards,
Community Support Team _ Jeffer Ni
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