Help with connecting cellular watch to plan - 106 error

[MGPH]

When I try to do set up my mobile plan on my apple cellular watch  using the 'Set Up Mobile Plan' in the Apple Watch App on my iPhone I receive the following O2 error message: "Oops, something went wrong. Try again and if the problem continues call 202 for free from your O2 mobile, quoting reference code 106".

The cellular Apple Watch was bought direct from the Apple.  I have a pay monthly sim only plan with O2 

Technical support have repeatedly said to reset and start again.  I have done this many time to no effect.   The phone and watch pair without problem it is just adding the cellular plan that is the problem.  Can anyone help please ?

[gmarkj]

As you have gotten nowhere with the normal customer services @MGPH , I'll mention the community advisors.

Can you see if you can help @O2Ryan @O2Jonathan ?

[MGPH]

Thank you  getting this solved will be much appreciated

[O2Jonathan]

Thank you for tagging me @gmarkj, I will private message you now @MGPH .