Cannot create or update posts using v3 library on a previously invitation-only blog

Hi:

I use the Blogger try It that page:
https://developers.google.com/blogger/docs/3.0/reference/posts/update#try-it

This works fine on a publicly accessible blog where the authenticated user 
is an "author". 
However, on a blog which was originally set to "invitation-only", with 
exactly the same user having administrator privileges, neither 
programmatic creation nor update works. But I can read the post.



{
"error": {
"errors": [
{
"domain": "global",
"reason": "forbidden",
"message": "We're sorry, but you don't have permission to access this 
resource."
}
],
"code": 403,
"message": "We're sorry, but you don't have permission to access this 
resource."
}
}


If i go to the post and change via browser, this works, otherwise doesn't 
work.
regards.

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