You can share task lists that you've created with other people.
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Select Share at the top of the task window.
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Select Create invitation link.
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Select Copy link.
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Open a new email message and address it to the people you want to share your list with.
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Paste the link into your message and send it.
Note: Email is just one way to share the invitation link. You can also send it to people using any messaging app, such as Microsoft Teams.
Manage sharing settings
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To limit sharing to the current list members select Share.
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Select Manage access.
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Select the toggle next to Limit access to current members to set it to on. This will disable the invitation link and limit list access to the current members.
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Alternatively, you can select the red Stop sharing button to turn off sharing for the task list. Once you stop sharing, only you will have access to the list.