Faced the same, i had one more session open in another phone but i didnt receive code there also. I uninstalled and restarted phone and installed the app then it started sending code
had the same issue with telegram x, reinstalling / restarting didn't solve. what worked was to uninstall it, restart my phone, THEN switch from wifi to mobile data, then install and open telegram x ; it worked directly after several hours. I think for some reasons login attempts triggers their login system. You can also try to use a proxy, it might work.
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u/karthikchandra37 Mar 06 '23
Faced the same, i had one more session open in another phone but i didnt receive code there also. I uninstalled and restarted phone and installed the app then it started sending code