Upload a video maybe?
Had oil change which could mean gunk has sucked onto the strainer and preventing oil going to the head quick enough hence the tapping.
This can be cleaned by removing the sump to access the strainer and then remove it clean ot and refit the sump back with gasket glue only made for sumps. Dirko being VAG approved and what I use for gasket glue.
RECOMMEND a cam follower change as my this is a major engine failure if it wears out and the fuel pump starts hitting the cam lobe which has happened to many. One o read about three weeks ago and the poster needed a new cam, cam follower and pump. costly. I replaced mine not long back. Not easy by all means but can be done with the correct tools.