Group or channel url(link) must be custom link format ("https://t.me/channelname)
Before Adding members to Groups and channels. You must be a member of group (Very important) you want to add members. No need of being admin. Adding members to your channels, you must be admin of that channel with administrator permission "add subscribers" enabled. Otherwise it won't work. Trial version for adding 5 members and premium for 9000 members/day adding.
Feel free to contact us on support@telegrammarketingsoftware.com for more.
