If you are experiencing issues getting other Summoners to join your Alliance, it may be that your Alliance’s privacy settings are set to "closed." Ensure that your privacy is set to “open” or “by request” to accept new members.
If you are the Alliance leader, you can change this setting by opening the Alliance menu and clicking on the Alliance note field. In the next menu, change the privacy settings by clicking the arrows to the left or right of the PRIVACY section, and be sure to click the SAVE button prior to exiting that screen.
If you have followed all the steps above and are unable to change your Alliance’s privacy settings, please contact Kabam Support for assistance.