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Setup default permissions to prevent Access Denied error after user sign-in

Users should sign-in to SharePoint at-least once so his/her profile need to be created and then his/her account will be shown in SharePoint users list and then you can give them some permission, but sometimes you need to give permission to someone before he/she sign-in to your site.
  • If you want to let anyone sign-in to your site, simply grant "All Users (ShetabLiveAuth)" to visitors of your site or enable anonymous access.
  • If you want just specific user sing-in to your site, you can specify access to any user that has specific e-mail address without actually knowing who is he or she. For example you can add someone@gmail.com to be site member, so anyone who set that e-mail address in his/her user profile and verify it will be a site member.
Note: You can use star character (*) to specify access for anyone that verify an email with specific domain. Example: *@yourdomain.com. With this wildcard you can set default access for your own domain members.
Note: Grant Privilege By Access Key (Coupon) is other way to grant permissions to someone who not sign-up yet.