Can't create new Contact in Message+ on Windows desktop


So, I get a text from a new person that shows only the phone number in the message list.
Go to the Menu, click Contacts. Click New Contact. Enter info. Click Add and get error:

Please enter a valid phone number

Of course, the number(s) I've tried are valid.
Solutions? Ideas? Or is it as a suspect, Verizon doesn't or won't put much into making DESKTOP software work well?

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