Based on our research, what you're mentioned doesn't seem to be achievable yet, which cannot add office 365 group o add/remove users from all the Teams.
Meanwhile, to get this feature more quickly, we also recommend you give the feedback in Teams UserVoice and help us make improvements and build new products. Many features of our current products are designed and upgraded based on customers’ feedback. With requirements like this increase, the problem may well be released in the future. Thanks for your understanding and support.
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