Why might a programmer be unable to save a Remote Settings entry?

The reason why a programmer might be unable to save a Remote Settings entry is that key names cannot contain the : character. Unity Remote Settings has specific rules regarding the format and structure of the keys used for entries. The presence of invalid characters in the key name can result in a failure to save that entry because it violates these predefined constraints. Therefore, using a character like ':' would trigger an error, making it impossible to save that particular setting.

Other reasons for failing to save entries, such as having entries that are too long, improper configuration of settings, or the feature being disabled, are certainly possible challenges but do not directly relate to the specific restriction on key name formatting, which is the focus in this case. Understanding these constraints is critical for developers to ensure that their settings are structured correctly for successful storage and retrieval within the Unity environment.