Adding to Pstork1 ,this feature is by design. As per Microsoft Flow ( Now known as Power Automate) architecture, Flow works on trigger + action steps. You can’t use
more than one trigger at a time while creating a Flow. Button( Manual trigger a Flow ) and Schedule (Recurrence) are two different triggers. So you have to replace the trigger to
use recurrence to make it automatic. So the behavior is by design.
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Thanks,
Sanjaya