What options does my Nigerian friend have after his Thai visa was denied without a stated reason?

A user shared that their Nigerian friend had his Thai visa denied without a clear reason stated in the notification. The community provided insights, suggesting that applicants might face difficulties if they are not in Thailand and the agent used may have contributed to the problem. It was confirmed that there is typically no appeal process for visa denials, and the friend might consider applying at a different embassy. However, some members emphasized the challenges due to Nigeria's reputation regarding visa applications and scams. The general advice leaned towards checking local immigration guidance and possibly delaying another application.