Email Intent subject is ignored in gmail, but works with other mail clients

ACTION_SENDTO is not documented to support any extras. So, while you are welcome to include EXTRA_SUBJECT, do not assume that any particular app responding to ACTION_SENDTO will honor it.

Even for places where extras are documented — ACTION_SEND documents support for EXTRA_SUBJECT, for example — there is no requirement for every app to honor every extra.

Gmail seems to ignore Intent extras. Try this instead:

Intent j = new Intent(Intent.ACTION_SENDTO);
j.setData(Uri.parse("mailto:[email protected]" +
    "?subject=Request approval for Kiranam Registration - " + KiranamUserId));
j.putExtra(Intent.EXTRA_SUBJECT, "Request approval for Kiranam Registration - " + KiranamUserId);
startActivity(Intent.createChooser(j, "Select your mail account to send mail for Approval"));

I found that setting the data part of the intent to Uri.parse("mailto:") and defining the email via Intent.EXTRA_EMAIL works fine:

Intent(Intent.ACTION_SENDTO, Uri.parse("mailto:")).apply {
    putExtra(Intent.EXTRA_EMAIL, arrayOf("[email protected]"))
    putExtra(Intent.EXTRA_SUBJECT, "Support request")
    putExtra(Intent.EXTRA_TEXT, "Hello team!")
}