Roblox error code 403 is caused by an authentication error. Here's how to fix Roblox error code 403 once and for all.

Fix Authentication Failed, Error Code: 0, An error was encountered during authentication on Roblox by following the suggestions in this post.

If you have encountered the Roblox Authentication Error Code 901 on Xbox or Windows 11/10 PC, try the solutions in this post to resolve the issue.