I have created SampleZoomSDK project, in which I implemented custom invitation and this was working fine but when I merged this demo project with my existing project then I had to change package name and custom invitation method is not working there. I have made required changes in manifest and config file.
After spending too much time, my issue has been resolved. In my case, package id in gradle and package name was different. So I had to change that and now custom invitation is listed. If anybody is facing same issue then please, check all the requirements in gradle, manifest and also in config.xml. I hope it will work.
Thanks for the post and glad to hear that the problem has resolved. You may refer to the replies in Custom invitation method for further information. If you have any other questions, please let us know.