How to fix an error in WP /wp-json/wp/v2/users/me?_locale=user 403?

Did MultiSet on the EP, installed the plugin to disable the REST API , but I realized that nothing made a rollback yesterday and stumbled on this error when editing a page, and generally when you save changes, it always comes out this error only with different queries. Before that everything worked, I think maybe because of the MultiSite, you do not want to roll back to the old version so much work into the trash.
I can tell, maybe someone had this error and how did you fix the problem?

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April 7th 20 at 10:58
2 answers
April 7th 20 at 11:00
Introduced in the subdomain https://api.qb2b.ru/wp-json/wp/v2/users/me?_locale... gave the answer:
{"code":"rest_not_logged_in","message":"\u0412\u044b \u043d\u0435 \u0430\u0432\u0442\u043e\u0440\u0438\u0437\u043e\u0432\u0430\u043d\u044b.","data":{"status":401}}
April 7th 20 at 11:02
It seems that the broken authorization. Check
  1. .htaccess and wp-config.php on the subject of something that should not be there
  2. Reinstall the very core of the EAP.

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