WP_Error could not be converted to string

There are few problems with your code.

First of all, let’s see at wpmu_create_blog function:

wpmu_create_blog(
    string $domain,
    string $path,
    string $title,
    int $user_id,
    array $meta = array(),
    int $network_id = 1
)

So you use it incorrectly. It’s 5th argument is $meta and you put $network_id in there…

Another problem is that this function can return int (the ID of new site) or WP_Error if some error occured.

You ignore that and assume it always ends with success. And that is causing your error – function returns WP_Error and you treat it as int.

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