Node access based on the user reference field

I have a content type that is used for temporary access. The node is created and has an expiration date; it’s deleted after that date. On this node there is a user reference field; only the users added to this field should have access to viewing this node. I can’t find a hook to handle this access. In Drupal 7 I used hook_node_access(), but it doesn’t seem to exist for Drupal 9.

The only information I’m looking for is how to tap into the access privileges for a given node type. After that I can handle the logic of what users are contained in the reference field.

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Node access based on the user reference field

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