Creating multiple campaigns is limited for Google AdWords services.
See the following.
Name | OS | Limitation |
AdMob / GDN | Android | 1 campaign only |
iOS | 1 campaign only | |
Search / Listing | Android | 1 campaign only |
iOS | - (Multiple campaigns available) | |
Youtube / TrueView | Android | 1 campaign only |
iOS | 1 campaign only |