I have made a test on my side (Use 'Track your work hours and work location' built-in template to create flow) and the issue is confirmed on my side. The same error message as you shows up as below:
Even though, I re-created my flow from scratch, when I start the flow from the iOS widget, the same error shows up as above.
Thanks for your feedback, I would put this issue to my product team, if the issue is solved, I would reply here.
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