Until yesterday (20 Jan) I could connect to another google drive account (using drive.\_mount), but when I tried this today, google colab showed me this error:

```
from google.colab import drive
drive._mount('/content/drive/')

    /usr/local/lib/python3.7/dist-packages/google/colab/drive.py in _mount(mountpoint, force_remount, timeout_ms, use_metadata_server, ephemeral)
    294       wrote_to_fifo = True
    295     elif case == 5 and not use_metadata_server:
--> 296       raise ValueError('mount failed: invalid oauth code')
    297     elif case == 6:
    298       # Terminate the DriveFS binary before killing bash.

ValueError: mount failed: invalid oauth code

```

Strange thing is that error tells me "invalid oauth code", but not let me connect to google page and copy the code!

And I set use\_metadata\_server=True but this time, new error appeares:

```
    from google.colab import drive
    drive._mount('/content/drive/', use_metadata_server=True)
ValueError                                Traceback (most recent call last)
<ipython-input-5-42a561ce7057> in <module>()
      1 from google.colab import drive
----> 2 drive._mount('/content/drive/', use_metadata_server=True)

/usr/local/lib/python3.7/dist-packages/google/colab/drive.py in _mount(mountpoint, force_remount, timeout_ms, use_metadata_server, ephemeral)
    285             ': timeout during initial read of root folder; for more info: '
    286             'https://research.google.com/colaboratory/faq.html#drive-timeout')
--> 287       raise ValueError('mount failed' + extra_reason)
    288     elif case == 2:
    289       # Not already authorized, so do the authorization dance.

ValueError: mount failed

```

Also I used drive.mount but showed pop-up and ask me to enter another account credentials. When I enter it, this error appears:

```
from google.colab import drive
drive.mount('/content/drive/')

MessageError                              Traceback (most recent call last)
<ipython-input-1-91874b305a32> in <module>()
      1 from google.colab import drive
----> 2 drive.mount('/content/drive/')

3 frames
/usr/local/lib/python3.7/dist-packages/google/colab/_message.py in read_reply_from_input(message_id, timeout_sec)
    104         reply.get('colab_msg_id') == message_id):
    105       if 'error' in reply:
--> 106         raise MessageError(reply['error'])
    107       return reply.get('data', None)
    108 

MessageError: Error: credential propagation was unsuccessful

```

I think this is new policy. Is there an solution?