You can set custom content into forbidden product access, For example:
This product is forbidden, you have not access to view it
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Sit amet conse ctetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit.
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You can set custom content into forbidden product access, For example:
This product is forbidden, you have not access to view it