DId you get your APU Graphics driver from HPE Support Driver download page or from AMD Download page?
Here is HPE Support Driver for your APU : HPESC Search Results
Also there is a Gen 10 Service Pack from HPE from 03/01/2019: HPESC Search Results
AMD Download page doesn't have a specific AMD Driver for the Opteron X3418. Only for the Opteron X3421. But the driver seems to be the same for both.
If HPE own APU Driver still giving you Error code 43 then I suggest you contact HPE Support and also post your question at AMD Server Gurus and see if anyone else in that AMD Server Forum is having a similar issue.