login.py fails with Plerom after secret is entered

[utzer]

After copying the secret over from Pleroma to command line where I started login.py I get this error:
Traceback (most recent call last):

  File "/home/utzer/.local/lib/python3.10/site-packages/mastodon/Mastodon.py", line 525, in log_in
    response = self.__api_request('POST', '/oauth/token', params, do_ratelimiting=False)
  File "/home/utzer/.local/lib/python3.10/site-packages/mastodon/Mastodon.py", line 3425, in __api_request
    raise ex_type(
mastodon.Mastodon.MastodonAPIError: ('Mastodon API returned error', 400, 'Bad Request', 'Invalid credentials')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/utzer/ocrbot/login.py", line 66, in <module>
    cfg['secret'] = client.log_in(code=input("Secret: "), scopes=scopes)
  File "/home/utzer/.local/lib/python3.10/site-packages/mastodon/Mastodon.py", line 533, in log_in
    raise MastodonIllegalArgumentError('Invalid access token or redirect_uris: %s' % e)
mastodon.Mastodon.MastodonIllegalArgumentError: Invalid access token or redirect_uris: ('Mastodon API returned error', 400, 'Bad Request', 'Invalid credentials')

Wondering if there is any tip why the connection fails.