Unable to identify objects within Iframes using chrome browser.

I think the topic has been discussed in below threads,

https://community.smartbear.com/t5/TestComplete-General-Discussions/Find-text-on-a-page-even-if-it-s-in-an-iframe/td-p/53200

https://community.smartbear.com/t5/TestComplete-General-Discussions/unable-to-navigate-to-another-iFrame-in-the-same-page/td-p/146400

https://community.smartbear.com/t5/TestComplete-Functional-Web/Finding-objects-within-iFrames/td-p/90547

Also you may want to see this link since it has some points related to your chrome specific issue.

http://support.smartbear.com/testcomplete/docs/app-testing/web/general/considerations.html#specifics-of-web-testing-in-chrome

First of all... don't use xPath.

Second of all... have you attempt to use the Object Spy tool in TestComplete to see how TC identifies the components within the iFrame?  If you want to know how to get TC to use those objects, that's the best way to do so.