(repost) SFP+ DAC cable, HP J9281B and RB5009

Dear all!
Posted the below in RouterOS General with no replies - perhaps this is a better place?

I am inclined to throw in the towel on the HPE DAC cable and by a Mikrotik Switch (CSS610-8P-2S+IN) which I assume will work at 10G speeds..

Original post below, no solution yet:

I am got happy when I realised that my Aruba 1930 8g Instant On had 2 SFP+ ports and my new RB5009UPr+S+IN also had an 10G SFP+ port.
First I tried with a “generic” Mikrotik SFP+ cable (H!Fiber) - this was detected by the RB5009 but not the Aruba Switch..
Searching the internet I found out that HPE has a different coding/firmware on the DAC cable (did I understood this right?) - so I found a HPE original cable, a J9281B.

With this Cable the Aruba Switch detects the cable, but not the RB5009..

Have tried various settings, Auto Negotiation on/off - advertise 10G etc - I can not get it to work at 10G speed.
Turning off Auto Negotiation I can get 10M, 100M and 1G to work (full duplex) but NOT 10G..

I have tested RouterOS 7.9.1, 7.9.2 and 7.10rc5 - nothing gets it running at 10G.

My RB5009 “sees” the cable, as per below:

Vendor Name WL GORE
Vendor Part Number SCN-2002-2
Vendor Revision D
Vendor Serial CN1335JXXX
Manufacturing Date 11-08-20

I am at loss.. Anyone with experiance of interconnecting HPE SFP+ with Mikrotik?