create site api endpoint gives internal server error and doesn’t create website

I have create a WordPress multi site, and now I am trying to add sub sites via the REST API, but I am unable to create,

the website seems to be working fine, and I can create the subset normally front the dashboard, but via the api it gives internal server error.

this is the code I am using and the error (server response)

    wordpress_endpoint = "https://aiwebsitebuilder.tech/wp-json/wp/v2/sites/create"
    wordpress_username = '[email protected]
    wordpress_password = 'xxxx xxxx xxxx xxxx xxxx xxxx'
    auth = (wordpress_username, wordpress_password)
    
    
    wordpress_data = {
        "title": "My New Site",
        "admin_email": "[email protected]" ,
        "domain": custom_domain_name
    }
    wordpress_response = requests.post(wordpress_endpoint, auth=auth, json=wordpress_data)
    
    if wordpress_response.status_code == 201 or wordpress_response.status_code == 200:
        print("WordPress site created successfully!")
    else:
        print("Failed to create WordPress site")
        print(wordpress_response.text)
        print(wordpress_response.status_code)
        

would love any help I can get

Error:

Failed to create WordPress site
{"code":"internal_server_error","message":"<p>There has been a critical error on this website.<\/p><p><a href=\"https:\/\/ww.wp.xz.cn\/documentation\/article\/faq-troubleshooting\/\">Learn more about troubleshooting WordPress.<\/a><\/p>","data":{"status":500},"additional_errors":[]}
500