@unknowwwnn Looks like you are trying to pass multiple email addresses. You can only pass a single email address. If you want to use the Get user profile (V2) action on multiple email addresses you need to convert the string of email addresses into an array of email addresses and loop through them.
Add a Compose action and use an expression. Insert the split() function. This function takes two parameters:
split([string],[separator])

Click on the dynamic content tab and insert the To dynamic content.

Add a comma and a semi-colon between single quotes. Run a test.

The split() function will output an array of email addresses.
Add an Apply to Each action to loop through your array.

Hope this helps!
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