'expressly accepted' is correct and usable in written English.
You can use it when you want to express clearly that something has been accepted without any doubts or qualifications. For example, "It was expressly accepted by all members of the team that the changes proposed by the supervisor were necessary."
It is time for all three political parties to let us see their detailed proposals and to expressly accept that this is a constitutional debate qualitatively different from, say, the future of education or even treatment of the national debt.
There is unending debate on whether Africa should expressly accept GMO foods or products to deal with its perpetual food insecurity.
Those restrictions on sovereignty are usually explained as deriving from consent or autolimitation, but it can easily be demonstrated that in some cases states have been considered as bound by certain rules of international law despite the lack of satisfactory proof that these rules were expressly or implicitly accepted by them.
"They have to accept expressly the aim of Geneva II," Mr. Fabius said, using the diplomatic shorthand for the proposed conference.
The machine screw is supposed to fit perfectly because it is screwed into a socket expressly designed to accept it.
The English queen, however, in her instructions to Leicester, had expressly declined to accept offers of sovereignty from the United Provinces while still demanding of the States to follow the "advice" of her lieutenant-general in matters of government.
In 2007, the EQ-5D-Y version which was developed expressly for use in children was accepted as the definitive version of the EQ-5 D to be used with children.
The report states there was "no public interest in the story" and accepted that neither parent had "expressly consented to publication".
