Is it possible to store a list of current online players without a server?

Question

Unity

Hello! At once I will make a reservation that I could not absolutely correctly form an essence of a question.
I use accounts to enter the game, but the game itself is not networked. I somehow need to store a list of accounts that are currently active in the game, so that it is impossible to enter the account until the current session is terminated. The fact is that I don’t know how to make a server and I have nowhere to keep it turned on all the time, the maximum that I use is hosting with mySql.

Or is it without options, you need to cut at least a simple, but a server? Thank you.

Answer 1

the maximum that I use is hosting with mySql

here

Answer 2

You can use ready-made solutions - playfab for example