When I save PDF with password show error The document not be saved . Bad parameter

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Could you help I can't save pdf there show as below 

[Amal.]

Hi there

Hope you are doing well and sorry for the trouble. As described you are unable to save the pdf with password and getting the bad parameter error.

Is this a behavior with a particular PDF file or with all the PDFs? Please try with a different PDF file and check.

Is this PDF file has a signature? once a docuemnt is signed you cannot make any changes even adding a password. The password must be added before the digital signature.

You may also look at the similar discussion https://community.adobe.com/t5/adobe-acrobat-online/bad-parameters-when-saving-a-document-as-passwor... and see if that helps.

Regards

Amal