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I get redirected to the login page of my Sendy installation and I tried everything on your trouble shooting page. Could you have a look?
Please check the troubleshooting guide again ? https://sendy.co/troubleshooting#login-page-reloads-without-error-message
Also check with your hosting provider that your session.save_path is set to the right directory and it is writable, it is currently set as /tmp