Using App Engine Python 2.7 Standard

Since about two hours, my operation to create a zip file on GCS is failing. 
Before this, it was working fine. 
The following line 

import cloudstorage as gcs
...
with gcs.open(new_zf.gcs_filename, 'w', content_type=b'multipart/x-zip',
                  options={b'x-goog-acl': b'public-read', b'cache-control': 
b'private, max-age=0, no-cache'}) as nzf:

triggers this error

<Error><Code>InvalidAuthentication</Code><Message>The provided 
authentication header is invalid.</Message><Details>Cannot use OAuth 
Authorization header with form POST.</Details></Error>". Extra info: None.

I have tried to change permissions on my roles on GCS from Storage Legacy 
Owner to Storage Admin

but I get a 'Sorry, there’s a problem. If you entered information, check it 
and try again. Otherwise, the problem might clear up on its own, so check 
back later.'  error

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