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You will first have to delete the user(s) from within myday. You can do this using the identity User management app. Once the user(s) have been deleted, we can use the provision on demand option.
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The user should now be resynced back into myday.
Resync group/ group(s) membership
Follow steps 1-4 above.
Now select the ‘Provision on Demand’ button
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Search the group you wish to sync.
Then select the user’s you wish to sync the membership of
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Once the user has been selected, click on provision on the bottom of the window.