Groups and channels run on Telegram. Each group’s admins and Telegram’s own limits decide who can write or join; Luckgram shows the client’s message for each case.
The message field or the error names the reason:
These are Telegram rules, so another Telegram app shows the same restriction.
Telegram limits how many channels and supergroups one account can join. A Telegram Premium account gets a higher limit. Telegram Premium is Telegram’s own subscription; Luckgram Premium is a separate plan (see Plans, Gems, and referrals).
At the limit, the app tells you to leave some groups or channels before joining a new one. On iPhone and iPad it lists your most inactive groups and channels to choose from. The limit applies to each Telegram account separately.
Sources: Evidence ledger
Telegram restricts an account when people mark its messages as unwanted and Telegram’s moderators agree. Private messages to someone who has not saved your number then fail with “Sorry, you can only send messages to mutual contacts at the moment.” You may also see “Sorry, you are currently restricted from posting to public groups.” On iPhone and iPad, More Info in that alert opens @SpamBot.
While it lasts, Telegram still lets you:
How long it lasts. The first time, it most likely ends after a few days. Each repeat lasts longer, and writing to strangers can be closed for good. Telegram does not end it early on request.
Think it is a mistake? Write to @SpamBot and explain. A new account can also be restricted because of the number’s previous owner or because it is a virtual number.
Can’t send anything at all? If the chat list says Your account is frozen, Telegram restricted the account after complaints: you can read your chats but can’t send messages. Tap the notice for details and Submit an Appeal. The appeal goes through @SpamBot and must be sent before the date shown, or the account is deleted.
Only one person can’t be reached? Some people accept messages only from their contacts and Telegram Premium subscribers; the app then says only Premium subscribers can message them. Others ask for Telegram Stars for messages from people not in their contacts. That is their choice, not a restriction on your account.
The restriction is on your Telegram account, not on the app, so every Telegram app, Luckgram included, shows it too.
Sources: Evidence ledger