404 error, can't install modules or activate license key

Just purchased GP Premium and I'm getting a 404 error when trying to activate license and install modules.

I've already tried whitelisting IP in firewall, I don't think that's the issue.

Here's some of the errors:

2022/06/02 04:42:52 [error] 293828#293828: *1339 "/var/www/mpadmin99/data/www/mysite.com/wp-json/wp/v2/index.php" is not found (2: No such file or directory), client: 172.70.86.35, server: mysite.com, request: "GET /wp-json/wp/v2/ HTTP/1.1", host: "mysite.com", referrer: "https://mysite.com/wp-admin/themes.php?page=generate-options"

2022/06/02 04:42:58 [error] 293828#293828: *1339 openat() "/var/www/mpadmin99/data/www/mysite.com/wp-json/generatepress-pro/v1/modules" failed (2: No such file or directory), client: 172.70.86.35, server: mysite.com, request: "POST /wp-json/generatepress-pro/v1/modules?_locale=user HTTP/1.1", host: "mysite.com", referrer: "https://mysite.com/wp-admin/themes.php?page=generate-options"