eing taken 'off line' 是现在分词的被动结构,在句中充当issues的后置定语.
该结构强调被修饰词(issues)和动词短语take...off line之间为被动关系（动宾关系）,且后者所表示的动作在当时正在进行.
楼主可以把它转换成定语从句去看,即：
The team can agree to certain issues being taken off line.
= The team can agree to certain issues (which/that are being taken off line).
再如：Have you ever visited the bridge being built now?
你去看过现在正在建造的大桥吗?
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