Comment # 2 on bug 1214415 from Krasimir Ivanov

Please see description of this issue in Gnome from
https://gitlab.gnome.org/GNOME/NetworkManager-openvpn/-/issues/83
This very problem is described in detail there.

I saw the problem on a customer computer and now I can't access that computer.
Unfortunately, I don't have a chance to take a screenshot of the error message.

Then I found a way around the problem by commenting out the .ovpn file,
deleting the line that says "pkcs12 my_access.p12" and putting a definition for
a fake TLS. Then I manually changed the settings of the thus imported
connection by specifying the location of the corresponding pkcs12 certificate
in the NetworkManager GUI. After that, this connection worked normally and the
customer works with it every day.