Solved Theme Builder does not load

I had a similar issue of Theme Builder not displaying in the menu and when trying to access it at /wp-admin/admin.php?page=et_theme_builder I just got an error message of you're not allowed to access this page.
I tried everything to fix it. I tried safe mode, permalinks, re-installing divi, rolling back a version, and nothing helped. Reading through code and going through the database to see what roles were assigned and to make sure I was still an administrator I found that Divi checks for administrator as the first role. In building some things lately I had to create some new test roles and they were added to my ID. They were showing up like this in the database a:3:{s:13:"testa_manager";b:1;s:13:"administrator";b:1;s:14:"customer_testa";b:1;}

In phpMyAdmin I ran this query to change the order. (You can hand code if you like)

-- Find your user ID first
SELECT ID FROM wpex_users WHERE user_login = 'admin';
-- Reorder roles so administrator is the FIRST one reset() returns
-- Replace 123 with your actual user ID
UPDATE wpex_usermeta
SET meta_value = 'a:3:{s:13:"administrator";b:1;s:13:"testa_manager";b:1;s:14:"customer_testa";b:1;}'
WHERE user_id = 123 AND meta_key = 'wpex_capabilities';

I was then able to get to the Theme Builder page (/wp-admin/admin.php?page=et_theme_builder) and it was once again visible in the Divi menu.

Divi calls reset() on that array and gets testa_manager as my "role" and not administrator. Since testa_manager isn't in Divi's allowlist (administrator, et_support_elevated, et_support), Theme Builder is treated as a dangerous capability I wasn't allowed to use. The menu item never registered for me. That's the reason I didn't see Theme Builder in the Divi submenu and why I was getting the 403 error.

Divi could use WordPress's get_role() to iterate all roles, OR
Use user_can( 'administrator' ) (capability check), OR
Store an explicit "primary role" meta separately.

Any of these would have saved a couple of hours of frustration.

Took almost 2 hours of trying things and reading through code to figure out what was happening.

Hope this helps anyone else out there doing custom code on sites built in Divi.

- Neil