A phrase that presents a Cartesian problem in any language: if your audience has the intellectual capacity to read and comprehend your prose, Q.E.D. by doing so it must be being advised, becoming aware, or taking note of what you have to say. If it is not reading your prose, then asking it to do so when, transparently, it isn’t, won’t make a damn of difference.

Towards more picturesque speech
PARENTAL ADVISORY: NOT IDIOMATIC ENGLISH
SEC guidance on plain EnglishIndex: Click to expand:
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“I told you to pay attention.”

“Perhaps; but when you told me to pay attention — if indeed that is what you did — I wasn’t, well, paying attention.”

So, you needn’t say please be advised, please be aware, or please note, or “PARENTAL ADVISORY”. This we can sum up in the famous Latin maxim: animadverto ergo scio:[1] “I am paying attention, therefore I am aware”.

Please be advised also fails quite badly if any part of your objective is to nudge, to gently persuade, or at any rate to provoke in your audience a sentiment other than outright resentment. This might be your goal should your correspondent be your client, at least as long as you are not in the process of closing that client out, or formally notifying it that you have, that very morning, instituted legal proceedings against it to recover several million pounds.

Look, we know clients are a pain in the arse. Everyone knows that life would be so much easier if you didn’t have to deal with them. But client relationship management is, or ought to be, the pantomime of affecting some positive camaraderiem, however hard it may be to live with yourself as a consequence. This is your Faustian pact. No-one, not even an idiot, likes being hectored. No-one likes being addressed like a wanton child.

There are ways of dressing a communication up to a wanton child so she feels like a valued member of the community. So, in stead of “Dear Client: please be advised that...” why not try:

“Hi Jeff,
Hope all is well. I am just writing to let you know that —”

References

  1. It’s not actually a famous Latin phrase. I made it up, with my secret Latin advisor’s help.