Their press release on Sunday confirmed that Cambage would not be picked after making herself unavailable but they were happy to assist her rehabilitation from an achilles injury.
According to what Opals head coach Brendan Joyce told the Herald Sun, Cambage's camp had refused to comply and he said everyone was disappointed with the current situation.
"At the end of the day we tried to compromise, but you can only compromise so far otherwise we would be jeopardising her own health by not putting her through a training session," Joyce said.
"And we would be jeopardising the team by someone deciding they want to come in when they want to come in.
"The team comes first and we are player-driven. The team is disappointed and everyone is, but everyone understands and supports the decision that was made by the coaching staff and Basketball Australia."
Cambage wrote to Joyce on Friday night to argue her case but Basketball Australia said the training session was mandatory if she was to feature against Japan.
She was due to return to Melbourne on Monday and she told the Herald Sun she was devastated with the decision to ban her.
"I was not aware that Basketball Australia was issuing a media statement tonight as I thought we were trying to work through things," Cambage said.
"I have been doing everything I can to keep everyone happy. I am devastated as anyone who knows me knows how much I love representing my country.
"But I am a person that does not pull out of things, whether it a professional commitment, a personal commitment or as a basketballer for my country.
"I want nothing more than to return to the court in my home town of Melbourne in August which is why I am once again asking Basketball Australia to let me attend this camp."
Cambage is working her way to full fitness after missing a year with an achilles injury and she's reportedly signed a $1m plus deal to play in China next season.
Australia will play three matches with Japan this week in preparation for the vital Olympic qualifiers with New Zealand in August.
