Email verification before account creation. There has been some issues where users who abandoned signup process (when you have more than one page of signup details) in middle were able to login without completion of full signup or even skipping the otp/passcode screen in PWAs. I hope this can help.
The custom action to send email is an example in this clone. Pls create your own custom action as you need. there is a tutorial by Adalo on send email custom action. Added below.