Welcome @Chris J, conversing in English is not a problem at all 

Adding a number to MijnKPN, is not sufficient to be able to share Mb's, the number has to be registered for ‘KPN Compleet’ or ‘KPN Hussel’ as well.  Can you please update your profiel and give me a heads up if you’ve done so? The phone number that doesn't pop up in the list to transfer data, can be noted in the ‘opmerkingen’ field 

Hello Maja:  I believe I have updated my profile.  I dont see a way to add the new number to my existing KPN Compleet subscription.  I have Internet/TV & 3 other mobile phones under that subscription.  If I try to change the new number, it tells me I cant.  Or I may be doing it wrong?

Thanks for any help you can offer

Thanks!

At this address, I can see one phone number that’s not registered for KPN Compleet, the one that's ending with 773. Is that the number you’re experiencing this problem with? Or are you experiencing problems with the number ending with 170? 

Hi.  The one ending in 773 is the one I can not add

Thanks, I can't add it either, I'm not sure why 

I've sent a message to a department that has more options then I do, and asked them if they can add the number. I think they'll be on it in the first half of next week, you'll receive a text message when the number is registered!

Okay - thank you very much! Hopefully it will work

You're welcome! Will you let me know if you receive the text message, so I'm sure it's been handled properly?   

Hi Maja.  I have not gotten a text yet.  Any idea how long it should take?

Hi @Chris J, it should be ok by now, even though you didn't receive a text message  Can you try to transfer data now? 

Maya - yes!! Thanks for all the help

🥳 Awesome! You're welcome