Looking on the internet deeply has found these results:

Please be informed that is the most popular phrase on the web.

kindly be informed that 1198,000 results on the web	Please be informed that 13,700,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Please be informed, there is a Santa Claus. Please be informed that this Directive automatically applies. Please keep me informed, Ellen. In relation to media pluralism indicators, please be informed that the Independent Study on Indicators for Media Pluralism in the Member States Towards a Risk Please keep us informed of developments. based Approach, was posted on the web on 30 September 2009 (see) so that all concerned can be informed. Regarding entry into Schengen, please be informed that the decision on the accession of Romania (and Bulgaria) to the Schengen area is a matter solely for the Council.

kindly be informed that

1198,000 results on the web

Please be informed that

13,700,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Please be informed, there is a Santa Claus.
Please be informed that this Directive automatically applies.
Please keep me informed, Ellen.
In relation to media pluralism indicators, please be informed that the Independent Study on Indicators for Media Pluralism in the Member States
Towards a Risk
Please keep us informed of developments.
based Approach, was posted on the web on 30 September 2009 (see) so that all concerned can be informed.
Regarding entry into Schengen, please be informed that the decision on the accession of Romania (and Bulgaria) to the Schengen area is a matter solely for the Council.