Hello.
Let’s try some alternatives to try to solve the problem: first, try restarting wazuh-manager (use for example: systemctl restart wazuh-manager). After that try to access the dashboard again. If this does not work, try deleting the browser cache and cookies related to Wazuh, as this may speed up the API update process.
You may also want to check the logs for errors to help find the root cause of the problem. Please check the /var/ossec/logs/api.log file for errors and if so, send them to me.