Sorry I can't help with your problem BUT, and I am not knocking this forum, I belong to a US based Mac Forum and they have dug me out of the mire several times with their specialist knowledge. Here is a link to that site:-
click here different forums are listed on the left hand side and the one you want is macOS - Operating System. If you can't fix your problem it may be worth joining up and seeing if they can help. It is free and NO ADVERTS.