Follow the below mentioned steps to disallow single Sign-On option for client in WHMCS.

Step::1 Login to your WHMCS.

Step::2 Go to Clients section and click on View/Search Clients.

Step::3 Now select the client from the list.

Step::4 Now jump onto the Profile section of the Client.

Step::5 Search for “Allow Single Sign-On” option and untick it.

Step::6 Click on Save Changes.

That's It !
Go through the video tutorial to get the procedure in detail. You may read out the blog as well.
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