The phrase "supposed to be informed" is correct and usable in written English.
It can be used when indicating that someone is expected or required to have knowledge about something.
Example: "As a team member, you are supposed to be informed about the latest project updates."
Alternatives: "expected to be aware" or "required to know".
Customers are supposed to be informed that the insurance policies are optional.
We are supposed to be informed as soon as a Saudi is taken in custody.
And if some patients experience serious side effects, all volunteers are supposed to be informed and then must consent again.
He said that groups are supposed to be informed of the restrictions when a reservation is made and again when it is confirmed.
That the shirtless F.B.I. agent apparently told Eric Cantor a couple of weeks before anyone told the President — or the members of Congress and the Senate who are supposed to be informed about intelligence developments — is just a starting point for that discussion.
Perhaps you think my enjoyment of the campaign is in fact an unwitting articulation of the problem: we're not supposed to be entertained by politics, we're supposed to be informed, and all this tomfoolery is diverting us from serious consideration of serious matters.
The theory that is supposed to be informing Fryer's choice of methods is therefore not applicable to this case.
In the end, this lack of real diversity is an insult to the public we are supposed to be informing.
When the governor and legislative leaders appoint commissioners, the public and journalists like me who are supposed to be informing the public barely pay attention, knowing little about the background, connections and qualifications of those appointees.
So firms are critically supposed to be consistently informed, and no personal and incomplete information is included.
At the MPA meeting, Sir Ian said there was a "protocol" in place which related to the way the police were supposed to be kept informed.
