Hi @Eloise Anderson
Thanks for your feedback and welcome to Q&A forum!
Since you have several questions, Due to each thread focus on only one issue. I will answer you the mainly question of your thread. You could post another issue by open a new thread. Thanks for your understanding!
For your fifth issue, I think it may related to Exchange online knowledge, you could ask it bay adding Exchange online tag. For Teams view, there is no such settings could change this confirmation of attendance email address.
For your sixth issue, you could copy the link and send it to another user by following this picture:
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