You can remove identities from your team roles by deleting the corresponding memberships.
To remove an identity from your team role
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Open the home page.
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In the Team Role tile, click Edit team role.
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In the Edit Team Role side panel, click the Memberships tab.
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On the Memberships tab, click Secondary memberships.
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Next to the membership you want to delete, select the check box.
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Click Remove.
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(Optional) In the Remove Memberships side panel, perform the following:
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For assignment requests: In the Reason for unsubscribing the membership field, enter why you want to remove the membership.
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For memberships assigned through dynamic roles: In the Reason for excluding the members field, enter why you want to delete the memberships.
 
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Click Remove memberships.
TIP: If you only selected direct memberships, confirm the prompt in the Remove Membership dialog with Yes.