Nokia 7.1 "CP Client" notifications

Hi all,

Yesterday I bought an unlocked Nokia 7.1 and put my iD SIM in it. It worked fine in the evening, but today (starting around noon) I occasionally get these odd notifications that you can see in the first screenshot I have attached:
"CP Client
New provisioning message"

If I then tap on the notification, it then comes up with another message, which can be seen in the second screenshot:
"New Provisioning
Do you want to apply new configuration?"
With options for "Postpone", "Delete" and "OK".

If I tap on OK, I get a prompt for a PIN (screenshot 3). It will accept any PIN there, as long as it's 4 digits.

These notifications pop up about every half hour, I think, and they're rather irritating. I've looked into solutions to stop it from happening (for example the instructions here: https://community.phones.nokia.com/discussion/comment/25837/#Comment_25837 which can also be found here: https://candid.technology/how-to-stop-provisioning-message-cp-client-nokia/ and on various other sites), but when I try to force stop the CP Client app on my phone, nothing happens (and the disable button is greyed out - see attachment 4).

Does anyone have any ideas for resolving this issue?

Technical details:
Model: Nokia 7.1 (TA -1100)
Android Version: 9 (Security Patch 1 June 2019)
Build number 00WW_3_54E