How do I see which accounts are waiting to be approved?

From the Open Athens dashboard for your organisation:

EITHER:

Click on the Join requests button on the right of the screen:

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Click on the Accounts menu, then click on Accounts awaiting approval:

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Doing either of these will take you to the same page of information that looks like this:
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Any new join requests need to be assessed and the correct action taken.

Move to another organisation/administrator
Approve
Reject and delete
Send an email query to the user.