Hi @mosimkhapathan ,
What I suggest is to set a field value on submit of the form, then use that field as the trigger to fire a Power Automate Flow to send the email.
Steps:
Create a new Yes/No field
Open your Form in Portal Management App, on your Form Metadata, select your field and choose set value on save, set the value to true.
Then create a new Power Automate Flow to use that Yes/No field as the trigger to send the email.
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Cheers,
Dom