Are there any known problems with the login?
The command works, if you then open the link, after you send the phone number the page loads almost indefinitely without anything happening.
The same happens when you enter the number in the chat.

Many hours later the following message appeared in the chat:

Unhandled exception while requesting code. Check console for more details.

The logs show the following:

[2024-04-25 10:08:16,864] [DEBUG@telethon.4870157579090013597.network.mtprotosender] Connection attempt 6...
[2024-04-25 10:08:16,881] [DEBUG@telethon.4870157579090013597.network.mtprotosender] Connection success!
[2024-04-25 10:08:16,881] [DEBUG@telethon.4870157579090013597.network.mtprotosender] New auth_key attempt 6...
[2024-04-25 10:24:08,183] [WARNING@telethon.4870157579090013597.network.connection.connection] Server closed the connection: [Errno 110] Operation timed out
[2024-04-25 10:24:08,184] [WARNING@telethon.4870157579090013597.network.mtprotosender] Connection error 6 during auth_key gen: TimeoutError: [Errno 110] Operation timed out
[2024-04-25 10:24:08,185] [WARNING@telethon.4870157579090013597.network.connection.connection] Graceful disconnection timed out, forcibly ignoring cleanup
[2024-04-25 10:24:09,186] [ERROR@mau.user.@julius:octonom.de] Exception connecting to Telegram, retrying in 5s... Traceback (most recent call last):
   File "/usr/lib/python3.11/site-packages/mautrix_telegram/abstract_user.py", line 313, in start
     await self.client.connect()
   File "/usr/lib/python3.11/site-packages/telethon/client/telegrambaseclient.py", line 554, in connect
     if not await self._sender.connect(self._connection(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/lib/python3.11/site-packages/telethon/network/mtprotosender.py", line 134, in connect
     await self._connect()
   File "/usr/lib/python3.11/site-packages/telethon/network/mtprotosender.py", line 260, in _connect
     raise ConnectionError('Connection to Telegram failed {} time(s)'.format(self._retries))
 ConnectionError: Connection to Telegram failed 5 time(s)
 [2024-04-25 10:24:14,193] [INFO@telethon.4870157579090013597.network.mtprotosender] Connecting to 149.154.167.51:443/TcpFull...
 [2024-04-25 10:24:14,193] [DEBUG@telethon.4870157579090013597.network.mtprotosender] Connection attempt 1...
 [2024-04-25 10:24:14,213] [DEBUG@telethon.4870157579090013597.network.mtprotosender] Connection success!
 [2024-04-25 10:24:14,214] [DEBUG@telethon.4870157579090013597.network.mtprotosender] New auth_key attempt 1...