Webform field default value + Profile field value
According to Make profile fields avalaible as tokens, tokens for Profile fields was added, but it was added to dev 4 months ago. Since the 8.x-1.0-rc1 version was released 9 months ago, it does not have tokens. 

So either switch to dev version until they release it or apply the patch provided on #22 to 8.x-1.0-rc1.