unexpected authorization request

[Vertinskyj]

Code that causes the issue

...
client = TelegramClient('sess', api_id, api_hash)

async def main():
# Now you can use all client methods listed below, like for example...
await client.send_message('me', 'Hello to myself!')

with client:
client.loop.run_until_complete(main())

Expected behavior

greetings

Actual behavior

Re-authorization requirement: "Please enter your phone (or bot token):".

Traceback

No response

Telethon version

1.29.3

Python version

3.9.6

Operating system (including distribution name and version)

Windows 10

Other details

The file sess.session is in the same directory as the code file.

Checklist

• The error is in the library's code, and not in my own.
• I have searched for this issue before posting it and there isn't an open duplicate.
• I ran pip install -U https://github.com/LonamiWebs/Telethon/archive/v1.zip and triggered the bug in the latest version.

[Lonami]

If the .session file is not saved correctly after login, it cannot be used without having to login again. Telegram may also be closing. Regardless, I likely cannot reproduce the issue.

[Vertinskyj]

Thanks a lot.
Unfortunately I don't know how to save correctly, nor to check correctness ;(
Program doesn't work.

[Lonami]

The session should be saved on .disconnect(). This problem is likely not widespread or I'd expect more users to report this serious issue. Make sure the process can actually write to the session file.

[Vertinskyj]

This problem is likely not widespread or I'd expect more users to report this serious issue

I'm probably doing something wrong. But I don't understand what exactly.

The session should be saved on .disconnect().

I tried this way. The result is the same.

In addition: after each such session creation, the telegram program in the phone requires authorization when entering.

[Lonami]

If other sessions are logged out, then that's #4051.

[Vertinskyj]

Thank You!
The .session file works, the session has not been interrupted yet.
Belousov-Aleksandr's advice helped.