Generally we don't require access to your Google Ad Manager account, so for troubleshooting there are a couple of tools you can use depending on the ads in question.

Inline ads are served in webviews and can thus quite easily be inspected on your Bolt Web Reader. If you don't have a live web reader you can use your preview reader to the same effect. 

Troubleshooting ad delivery here can be achieved using the Google Ads Console, to do so simply append ?googfc to the end of the url, or &googfc if there's already a query string. The console that then appears will tell you whether the page has been correctly tagged and list all ad calls on the page and whether the calls successfully received an ad to display.

When ads do not appear as expected, a commonly seen message in the Google Ads Console is ‘Ad unit did not fill’, which means we're successfully requesting the ad but we are not receiving one back. There are many possible causes for this, all of which are to do with the way the Advert is set up in your GAM. Whilst we will try our best to help with troubleshooting, we cannot advise on how to set up the ad units or line items - in this case, support should be raised directly with Google. There are also many detailed Google Ad Manager docs which cover everything required to set up ads.