The group you applied to join does not accept SMS service, please contact the group for handling.

First of all, group networks cannot be handled by sending messages. The group network is not a service launched by mobile for a large number of users, but a service for groups. If you want to join the group network, you can find your unit's liaison officer, that is, your unit has a special person to contact the mobile account manager and ask the liaison officer to add it for you. You can also show the account manager a letter of introduction from your company, because the group business is aimed at the group, and you must prove that you are from your company.