Hi @Josh Hoffman
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. Since your question is related to Power Automate, which is not in our support scope.
The following suggestions are for reference only:
According to my tests, if you want to add a task and assign it, you can use the Create a task action.
You can enter the IDs or email addresses of the users you want to assign to in the Assigned User Ids field.
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