I had a working 8.6 version using for API V4_1 and it worked great. Upgraded to 8.7.1 and now getting a 500 error on login request. To test, I installed a fresh 8.7.1 (well actually it was 8.6 from installatron which did work and then I upgraded to 8.7.1) Same issue, 500 error on the /service/v4…

That’s wrong. I usually edit .htaccess file which located at: /public/legacy/ In Linux, web server root to: root /var/www/Folder/SuiteCRM/public You need to restart Apache2/Nginx.