Unfortunately a previous reply only provided partial information and not a complete reply (some of those suggestions are not things you can do yourself anyway). You can go through the earlier provided laundry list of possibilities if you want to spend the time doing additional research yourself (I have yet to see that contributor ever follow up to additional questions a person may have), or you can contact Apple directly for assistance with this. I would try restarting your device which can sometimes cure mysterious issues and only takes a minute to try. If that does not work, contact Apple.
Refer to this page for Apple Support features ➔ Contact - Official Apple Support
Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page under “Get more help” (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.
This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple Support - Apple Support For some countries look under “Other” listing at the end of the list. Not every country has telephone support, and phone numbers may only work when calling from the same country.