How to factory reset my iPad 9th generation when the device is managed?

The presence of a management profile indicates that the device is centrally managed by an Enterprise or Educational establishment.  Being centrally managed, applied management policies may inhibit your ability to erase or reset the iPad without seeking assistance from the IT Administrator that manages the device.

Be aware that if you are attempting reset the device to avoid detection of data/usage outside of your Acceptable Use Policy (if applicable) - unauthorised use or other activity - while the iPad is centrally managed you are unlikely to be successful.

Contact the system administrator that manages your iPad for help or guidance.

Be aware that devices that are configuration locked or otherwise managed by an MDM platform can usually only be released from central management by the platform that manages the device. Be aware that Apple will not assist with removal of management profiles.

Please see: How do you factory reset a managed iPad? - Apple Community

Sussybaka6969 wrote:

It is important

Which is why you have been provided with a link to the question you posted earlier. Two knowledgeable users have already posted replies.

You are welcome.