Use your custom domain dont use defult tracking domain.
I faced same problems before with adwords
On bing there is no problem with defult tracking domain but on adwords you need your own custom domain.
There are many cpa network with different kind of offers on it you can find all list of cpa network on www.affpaying.com but be aware there are not all cpa network which is trusted are listed many cpa network that is listed on affpaying i found them fraud also now a days there are many person...
Advertiser landing page url: www.afflifr.com
Your cpa tracking url: www.mb1.com/track/affid178181/89129
Use final url and landing page url as www.afflifr.com (use advertiser url on final and landing page url not your tracking url)
Once you completed setting up ads go to ads menu and...
-They want your little past experiences atleast you should know a bit about affiliate marketing.
-They want to look how you promote campaign and on which source.
-Many of the networks have started asking reference now so better you should have one reference.
-And your honesty