Have you tried deactivating the requester?

Hello @Full Fibre Fanatic. Greetings. Thanks for reaching Freshworks community. 

I understand that you want to revoke portal access for a single user, which may not be directly possible. However, you can try deleting the user, as @Jim Dumay  mentioned, if the sole purpose is to restrict them from creating tickets and checking ticket updates. 

Alternatively, please check if the domain restriction might help, where you can choose which users of certain domains can create tickets or sign up. Here’s an article for your reference. 

https://support.freshdesk.com/en/support/solutions/articles/218385

If this does not help, no worries, kindly share the use-case so we can check for alternatives.

Cheers,

Sujitha Dhanaseelan.
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