12. Is there a ban on donations from corporations with partial government ownership to candidates?

Election Code of the Republic of Azerbaijan, 2003 (as amended 2019).  https://www.msk.gov.az/uploads/qanunvericilik/Election-code_2020.pdf

ECode prohibits election funds of candidates and registered candidates from obtaining voluntary donations and assistance in kind or services to their election funds from legal entities (including foreign interests), of which more than 30% of the charter (property) capital belongs to the state or municipality on the day of official publication of the decision to hold elections (Art. 90.2.6 and 90.2.9).