4th sim slot does not work

Product: The Sims Mobile
Platform:Apple iPhone
List the specific devices you play with (e.g. iPhone 6s Plus, Samsung Galaxy S7) iPhone 11
OS Version 14.4.1
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? I purchased a 4th sim slot but it won’t work
What do you expect to see?
Connection Type Wifi
Please select your region Europe
Country Denmark

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I have purchased a 4th sim slot, but it won’t let me create or promote a sim into the family :/ does anyone have a fix?