The documentation on library properties file format is here
https://arduino.github.io/arduino-cli/0.19/library-specification/
The information for name states
Note that libraries with a
namevalue starting withArduinowill no longer be allowed addition to the Library Manager index as these names are now reserved for official Arduino libraries.
The library properties for our library shows
name=Arduino Cloud Provider Examples
This may not allowed. Go into the library properties file and change the first line to something not beginning with "Arduino" and all should be well. For example
name = Cloud Provider Examples
See if this change corrects the error message.