What OS is there? What is the environment like is it your office / for personal use? Have you updated the system recently? Are you sure that you supplied correct password for that on next time?
I think you are talking about the Telegram Mobile App. Once you log out of it, how will it know for which account it has to work. So login is essential.
A lot of services and apps require an active login. Once logged out they will not work properly. It's similar to a lot of apps, some work offline others require an active internet connection.
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