Client Login Method only authorizes if handle is bsky.social ??

[CommanderWaterford]

Tried via Python to login with my own domain handle and always get an Auth Error although in bsky.app I am authorized with this handle, trying it with another account (a bsky.social) it does work. Is this by design?!

Example code:

from atproto import Client
def main():
 client = Client()
 client.login('my-handle', 'my-password')
 client.send_post(text='First test!')
if name == 'main':
main()