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It's from the ethercat manual, I put a link there a post ago.
This is unique for this servo
 

You have a 1 ms cycle time in axis.ini. According to the manual you have it set to 2 ms. Change that withand check the value again with ethercat upload.
The error comes from the drive, it thinks the config is wrong.
The only thing to do is to follow the manual.
One thing I can think of is that it doesn't like variable PDOS.
But there aren't any complains about that.
You can as a next step test to define the receive and transmit PDOS
as on page 9 and 10. Include all pdo entries even the ones you don't use.
 

You should apt remove r8168 driver or it will take that one.
Best to check though, I might not remember this right.