Unable to create a Rest end-point

As of WordPress 5.5, register_rest_route()‘s permission_callback argument is required. You should be receiving/logging an error message to the effect of

PHP Notice: register_rest_route was called incorrectly. The REST API route definition
for /search-cert is missing the required permission_callback argument. For REST API
routes that are intended to be public, use __return_true as the permission callback.

More on the permission_callback argument can be found in the REST API Handbook.

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