It is important to ensure the Acrobat DC security settings permit access to the document by assistive technology. Verify that the Acrobat DC or Acrobat Reader DC security settings do not prohibit access by assistive technology by checking the Security tab of the Document Properties dialog.
Locate “Properties” in the File menu and select.
Select the Security tab of the Document Properties window.
Determine the security level needed. If security is not required, security need not be set —- by default, this will allow assistive technologies to access the document content. This is the default setting for Adobe Acrobat DC and Adobe Acrobat Reader DC.
If security is required, select “Password Security” as the security method from the drop-down list.
In the Permissions section of the Password Security Settings dialog, verify that the box labeled “Enable text access for screen reader devices for the visually impaired” is checked. Click “OK” when finished.