New Members do not have access to create topics in #platform-feedback (Feature Requests and Bug Reports) and some other categories such as Documentation Requests / Learning Resources. They must use the post approval process to create these topics. This process can be used for creating or replying to a topic in any category that’s restricted from New Members. Feature requests and bug reports posted in any other category will be removed.
The amount of time you’re on the devforum does not at all contribute to your status. Some get promoted to full member at different times than others. You’re still a new member, in which case you need to follow the post approval process to report a bug.