Hi!
So, first suggestion succeeded, right? This means we have one less problem to reach a happy ending!!!!
Now, let's discuss this new issue. My suggestion is... remove temporarily the 'Assignerd user ids' current value in 'Create task' action block (leave this input empty), reexecute the flow, and see if the task is created with the hyperlink.
Of the flow fails again, please share a screenshot with the error text displayed.
Hope this helps