it helps some times Make sure your bufferSize is small enough that you can force it to write to the blob trivially while developing. By default it's 512 so 512 logging events would have to occur before being written to the blob. You can change the setting to a much smaller amount to make it write more often. Something like
<bufferSize value="5" />
How to capture Log4net Appender errors when Log4net Debugging turned off
I wish did fix the issue. I found a solution. A nice, elegant one. All Appender classes in Log4net have a public property called ErrorHandler. By default, this is set to an instance of a class called OnlyOnceErrorHandler, that will log an error to the Debug feed (if enabled) and then stop reporting errors.